<s>
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
is	O
a	O
discontinued	O
mobile	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
developed	O
by	O
Microsoft	O
.	O
</s>
<s>
First	O
released	O
in	O
2015	O
,	O
it	O
is	O
a	O
successor	O
to	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
,	O
but	O
was	O
marketed	O
by	O
Microsoft	O
as	O
being	O
an	O
edition	O
of	O
its	O
PC	B-Device
operating	O
system	O
Windows	B-Operating_System
10	I-Operating_System
.	O
</s>
<s>
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
aimed	O
to	O
provide	O
greater	O
consistency	O
with	O
its	O
counterpart	O
for	O
PCs	B-Device
,	O
including	O
more	O
extensive	O
synchronization	O
of	O
content	O
,	O
Universal	B-Device
Windows	I-Device
Platform	I-Device
apps	O
,	O
as	O
well	O
as	O
the	O
capability	O
,	O
on	O
supported	O
hardware	O
,	O
to	O
connect	O
devices	O
to	O
an	O
external	O
display	O
and	O
use	O
a	O
desktop	B-Application
interface	O
with	O
mouse	O
and	O
keyboard	O
input	O
support	O
(	O
reminiscent	O
of	O
Windows	O
on	O
PCs	B-Device
)	O
.	O
</s>
<s>
Microsoft	O
built	O
tools	O
for	O
developers	B-Application
to	O
port	O
iOS	B-Application
Objective-C	B-Language
apps	O
with	O
minimal	O
modifications	O
.	O
</s>
<s>
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
smartphones	B-Application
are	O
eligible	O
for	O
upgrade	O
to	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
,	O
pursuant	O
to	O
manufacturer	O
and	O
carrier	O
support	O
.	O
</s>
<s>
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
was	O
designed	O
for	O
use	O
on	O
smartphones	B-Application
and	O
phablets	B-Application
running	O
on	O
32-bit	O
ARM	B-Architecture
processor	I-Architecture
architectures	O
.	O
</s>
<s>
Microsoft	O
also	O
intended	O
for	O
the	O
platform	O
to	O
be	O
used	O
on	O
ARM	B-Architecture
tablets	B-Device
with	O
screens	O
9	O
inches	O
or	O
smaller	O
in	O
size	O
,	O
but	O
such	O
devices	O
were	O
rarely	O
commercially	O
released	O
.	O
</s>
<s>
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
entered	O
public	O
beta	O
for	O
selected	O
Lumia	B-Device
smartphones	B-Application
on	O
February	O
12	O
,	O
2015	O
.	O
</s>
<s>
The	O
first	O
Lumia	B-Device
smartphones	B-Application
powered	O
by	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
were	O
released	O
on	O
November	O
20	O
,	O
2015	O
,	O
while	O
eligible	O
Windows	B-Protocol
Phone	I-Protocol
devices	O
began	O
receiving	O
updates	O
to	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
on	O
March	O
17	O
,	O
2016	O
,	O
pursuant	O
to	O
manufacturer	O
and	O
carrier	O
support	O
.	O
</s>
<s>
The	O
platform	O
never	O
achieved	O
any	O
significant	O
degree	O
of	O
popularity	O
or	O
market	O
share	O
in	O
comparison	O
to	O
Android	B-Application
or	O
iOS	B-Application
.	O
</s>
<s>
By	O
2017	O
,	O
Microsoft	O
had	O
already	O
begun	O
to	O
downplay	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
,	O
having	O
discontinued	O
active	O
development	O
(	O
beyond	O
maintenance	O
releases	O
)	O
due	O
to	O
a	O
lack	O
of	O
user	O
and	O
developer	B-Application
interest	O
in	O
the	O
platform	O
,	O
and	O
focused	O
on	O
serving	O
incumbent	O
mobile	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
as	O
part	O
of	O
its	O
software	O
and	O
services	O
strategy	O
.	O
</s>
<s>
Support	O
for	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
ended	O
on	O
January	O
14	O
,	O
2020	O
.	O
,	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
had	O
approximately	O
a	O
0.01	O
%	O
share	O
of	O
the	O
mobile	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
market	O
.	O
</s>
<s>
Microsoft	O
had	O
already	O
begun	O
the	O
process	O
of	O
unifying	O
the	O
Windows	O
platform	O
across	O
device	O
classes	O
in	O
2012	O
;	O
Windows	B-Protocol
Phone	I-Protocol
8	O
dropped	O
the	O
Windows	O
CE-based	O
architecture	O
of	O
its	O
predecessor	O
,	O
Windows	B-Protocol
Phone	I-Protocol
7	O
,	O
for	O
a	O
platform	O
built	O
upon	O
the	O
NT	O
kernel	O
that	O
shared	O
much	O
of	O
the	O
same	O
architecture	O
with	O
its	O
PC	B-Device
counterpart	O
Windows	B-Application
8	I-Application
including	O
file	O
system	O
(	O
NTFS	B-Application
)	O
,	O
networking	O
stack	O
,	O
security	O
elements	O
,	O
graphics	O
engine	O
(	O
DirectX	B-Application
)	O
,	O
device	O
driver	O
framework	O
and	O
hardware	B-Operating_System
abstraction	I-Operating_System
layer	I-Operating_System
.	O
</s>
<s>
With	O
the	O
addition	O
of	O
Windows	O
Runtime	O
support	O
to	O
these	O
platforms	O
,	O
apps	O
created	O
for	O
Windows	B-Device
8.1	I-Device
could	O
now	O
be	O
ported	O
to	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
and	O
Xbox	B-Device
One	I-Device
while	O
sharing	O
a	O
common	O
codebase	O
with	O
their	O
PC	B-Device
counterparts	O
.	O
</s>
<s>
User	O
data	O
and	O
licenses	B-License
for	O
an	O
app	O
could	O
also	O
be	O
shared	O
between	O
multiple	O
platforms	O
.	O
</s>
<s>
In	O
July	O
2014	O
,	O
Microsoft	O
's	O
then-new	O
CEO	O
Satya	O
Nadella	O
explained	O
that	O
the	O
company	O
was	O
planning	O
to	O
"	O
streamline	O
the	O
next	O
version	O
of	O
Windows	O
from	O
three	O
operating	O
systems	O
into	O
one	O
single	O
converged	O
operating	O
system	O
for	O
screens	O
of	O
all	O
sizes	O
"	O
,	O
unifying	O
Windows	O
,	O
Windows	B-Protocol
Phone	I-Protocol
,	O
and	O
Windows	B-Operating_System
Embedded	I-Operating_System
around	O
a	O
common	O
architecture	O
and	O
a	O
unified	O
application	O
ecosystem	O
.	O
</s>
<s>
On	O
September	O
30	O
,	O
2014	O
,	O
Microsoft	O
unveiled	O
Windows	B-Operating_System
10	I-Operating_System
;	O
Terry	O
Myerson	O
explained	O
that	O
Windows	B-Operating_System
10	I-Operating_System
would	O
be	O
Microsoft	O
's	O
"	O
most	O
comprehensive	O
platform	O
ever	O
"	O
,	O
promoting	O
plans	O
to	O
provide	O
a	O
"	O
unified	O
"	O
platform	O
for	O
desktop	B-Device
computers	I-Device
,	O
laptops	B-Device
,	O
tablets	B-Device
,	O
smartphones	B-Application
,	O
and	O
all-in-one	B-Device
devices	O
.	O
</s>
<s>
Windows	B-Operating_System
10	I-Operating_System
on	O
phones	O
was	O
publicly	O
unveiled	O
during	O
the	O
Windows	B-Operating_System
10	I-Operating_System
:	O
The	O
Next	O
Chapter	O
press	O
event	O
on	O
January	O
21	O
,	O
2015	O
;	O
unlike	O
previous	O
Windows	B-Protocol
Phone	I-Protocol
versions	O
,	O
it	O
would	O
also	O
expand	O
the	O
platform	O
's	O
focus	O
to	O
small	O
,	O
ARM-based	O
tablets	B-Device
.	O
</s>
<s>
Microsoft	O
's	O
previous	O
attempt	O
at	O
an	O
operating	O
system	O
for	O
ARM-based	O
tablets	B-Device
,	O
Windows	B-Operating_System
RT	I-Operating_System
(	O
which	O
was	O
based	O
upon	O
the	O
PC	B-Device
version	O
of	O
Windows	B-Application
8	I-Application
)	O
,	O
was	O
commercially	O
unsuccessful	O
.	O
</s>
<s>
During	O
the	O
2015	B-Application
Build	I-Application
keynote	O
,	O
Microsoft	O
announced	O
the	O
middleware	B-General_Concept
toolkit	O
"	O
Islandwood	O
"	O
,	O
later	O
known	O
as	O
Windows	O
Bridge	O
for	O
iOS	B-Application
,	O
which	O
provides	O
a	O
toolchain	B-General_Concept
that	O
can	O
assist	O
developers	B-Application
in	O
porting	O
Objective-C	B-Language
software	O
(	O
primarily	O
iOS	B-Application
projects	O
)	O
to	O
build	O
as	O
Universal	O
Windows	O
Apps	O
.	O
</s>
<s>
An	O
early	O
build	O
of	O
Windows	O
Bridge	O
for	O
iOS	B-Application
was	O
released	O
as	O
open	O
source	O
software	O
under	O
the	B-License
MIT	I-License
License	I-License
on	O
August	O
6	O
,	O
2015	O
.	O
</s>
<s>
Visual	O
Studio	O
2015	O
can	O
also	O
convert	O
Xcode	B-Operating_System
projects	O
into	O
Visual	O
Studio	O
projects	O
.	O
</s>
<s>
Microsoft	O
also	O
announced	O
plans	O
for	O
a	O
toolkit	O
codenamed	O
"	O
Centennial	O
"	O
,	O
which	O
would	O
allow	O
desktop	B-Application
Windows	O
software	O
using	O
Win32	B-Library
APIs	I-Library
to	O
be	O
ported	O
to	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
.	O
</s>
<s>
At	O
Build	O
,	O
Microsoft	O
had	O
also	O
announced	O
an	O
Android	B-Application
runtime	O
environment	O
for	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
known	O
as	O
"	O
Astoria	O
"	O
,	O
which	O
would	O
allow	O
Android	B-Application
apps	O
to	O
run	O
in	O
an	O
emulated	O
environment	O
with	O
minimal	O
changes	O
,	O
and	O
have	O
access	O
to	O
Microsoft	O
platform	O
APIs	O
such	O
as	O
Bing	B-Application
Maps	I-Application
and	O
Xbox	B-Application
Live	I-Application
as	O
nearly	O
drop-in	O
replacements	O
for	O
equivalent	O
Google	B-Application
Mobile	I-Application
Services	I-Application
.	O
</s>
<s>
Google	B-Application
Mobile	I-Application
Services	I-Application
and	O
certain	O
core	O
APIs	O
would	O
not	O
be	O
available	O
,	O
and	O
apps	O
with	O
"	O
deep	O
integration	O
into	O
background	O
tasks	O
"	O
were	O
said	O
to	O
poorly	O
support	O
the	O
environment	O
.	O
</s>
<s>
On	O
February	O
25	O
,	O
2016	O
,	O
after	O
already	O
having	O
delayed	O
it	O
in	O
November	O
2015	O
,	O
Microsoft	O
announced	O
that	O
"	O
Astoria	O
"	O
would	O
be	O
shelved	O
,	O
arguing	O
that	O
it	O
was	O
redundant	O
to	O
the	O
native	O
Windows	O
Bridge	O
toolkit	O
since	O
iOS	B-Application
is	O
already	O
a	O
primary	O
target	O
for	O
mobile	O
app	O
development	O
.	O
</s>
<s>
The	O
company	O
also	O
encouraged	O
use	O
of	O
products	O
from	O
Xamarin	B-Application
(	O
which	O
they	O
had	O
acquired	O
the	O
previous	O
day	O
)	O
for	O
multi-platform	O
app	O
development	O
using	O
C#	B-Application
programming	O
language	O
instead	O
.	O
</s>
<s>
Portions	O
of	O
Astoria	O
were	O
used	O
as	O
a	O
basis	O
for	O
the	O
Windows	O
Subsystem	O
for	O
Linux	O
(	O
WSL	O
)	O
platform	O
on	O
the	O
PC	B-Device
version	O
of	O
Windows	B-Operating_System
10	I-Operating_System
.	O
</s>
<s>
To	O
promote	O
it	O
as	O
being	O
unified	O
with	O
its	O
desktop	B-Application
equivalent	O
,	O
Microsoft	O
promoted	O
the	O
operating	O
system	O
as	O
being	O
an	O
edition	O
of	O
Windows	B-Operating_System
10	I-Operating_System
.	O
</s>
<s>
Microsoft	O
had	O
begun	O
to	O
phase	O
out	O
specific	O
references	O
to	O
the	O
Windows	B-Protocol
Phone	I-Protocol
brand	O
in	O
its	O
advertising	O
in	O
mid-2014	O
,	O
but	O
critics	O
have	O
still	O
considered	O
the	O
operating	O
system	O
to	O
be	O
an	O
iteration	O
and	O
continuation	O
of	O
Windows	B-Protocol
Phone	I-Protocol
due	O
to	O
its	O
lineage	O
and	O
similar	O
overall	O
functionality	O
.	O
</s>
<s>
Microsoft	O
referred	O
to	O
the	O
OS	O
as	O
"	O
Windows	B-Operating_System
10	I-Operating_System
for	I-Operating_System
phones	I-Operating_System
and	I-Operating_System
small	I-Operating_System
tablets	I-Operating_System
"	O
during	O
its	O
unveiling	O
,	O
and	O
leaked	O
screenshots	O
from	O
a	O
Technical	O
Preview	O
build	O
identified	O
the	O
operating	O
system	O
as	O
"	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
"	O
.	O
</s>
<s>
The	O
technical	O
preview	O
was	O
officially	O
called	O
the	O
"	O
Windows	B-Application
10	I-Application
Technical	I-Application
Preview	I-Application
for	O
phones	O
"	O
,	O
while	O
the	O
user	B-Protocol
agent	I-Protocol
of	O
Microsoft	B-Application
Edge	I-Application
contained	O
a	O
reference	O
to	O
"	O
Windows	B-Operating_System
Phone	I-Operating_System
10	I-Operating_System
"	O
.	O
</s>
<s>
On	O
May	O
13	O
,	O
2015	O
,	O
Microsoft	O
officially	O
confirmed	O
the	O
platform	O
would	O
be	O
known	O
as	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
.	O
</s>
<s>
A	O
major	O
aspect	O
of	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
is	O
a	O
focus	O
on	O
harmonizing	O
user	O
experiences	O
and	O
functionality	O
between	O
different	O
classes	O
of	O
devices	O
—	O
specifically	O
,	O
devices	O
running	O
the	O
PC-oriented	O
version	O
of	O
Windows	B-Operating_System
10	I-Operating_System
.	O
</s>
<s>
Under	O
the	O
Universal	B-Device
Windows	I-Device
Platform	I-Device
concept	O
,	O
Windows	O
Runtime	O
apps	O
for	O
Windows	B-Operating_System
10	I-Operating_System
on	O
PC	B-Device
can	O
be	O
ported	O
to	O
other	O
platforms	O
in	O
the	O
Windows	B-Operating_System
10	I-Operating_System
family	O
with	O
nearly	O
the	O
same	O
codebase	O
,	O
but	O
with	O
adaptations	O
for	O
specific	O
device	O
classes	O
.	O
</s>
<s>
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
also	O
shares	O
user	O
interface	O
elements	O
with	O
its	O
PC	B-Device
counterpart	O
,	O
such	O
as	O
the	O
updated	O
Action	O
Center	O
and	O
settings	O
menu	O
.	O
</s>
<s>
During	O
its	O
initial	O
unveiling	O
,	O
Microsoft	O
presented	O
several	O
examples	O
of	O
Windows	O
apps	O
that	O
would	O
have	O
similar	O
functionality	O
and	O
user	O
interfaces	O
between	O
Windows	B-Operating_System
10	I-Operating_System
on	O
desktops	O
and	O
mobile	O
devices	O
,	O
including	O
updated	O
Photos	O
and	O
Maps	O
apps	O
,	O
and	O
new	O
Microsoft	B-Application
Office	I-Application
apps	I-Application
.	O
</s>
<s>
Although	O
marketed	O
as	O
a	O
converged	O
platform	O
,	O
and	O
as	O
with	O
Windows	B-Protocol
Phone	I-Protocol
8	O
,	O
using	O
a	O
Windows	O
NT-based	O
kernel	O
,	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
still	O
cannot	O
run	O
Win32	B-Library
desktop	B-Application
applications	O
,	O
but	O
is	O
compatible	O
with	O
software	O
designed	O
for	O
Windows	B-Protocol
Phone	I-Protocol
8	O
.	O
</s>
<s>
Notifications	O
can	O
be	O
synced	O
between	O
devices	O
;	O
dismissing	O
a	O
notification	O
on	O
,	O
for	O
example	O
,	O
a	O
laptop	B-Device
,	O
will	O
also	O
dismiss	O
it	O
from	O
a	O
phone	O
.	O
</s>
<s>
The	O
messaging	O
app	O
adds	O
support	O
for	O
internet-based	O
Skype	B-Application
messaging	O
alongside	O
SMS	B-Device
,	O
similarly	O
to	O
Apple	O
's	O
iMessage	O
,	O
and	O
can	O
synchronize	O
these	O
conversations	O
with	O
other	O
devices	O
.	O
</s>
<s>
The	O
camera	O
app	O
has	O
been	O
updated	O
to	O
match	O
the	O
"	O
Lumia	B-Device
Camera	O
"	O
app	O
previously	O
exclusive	O
to	O
Lumia	B-Device
products	O
,	O
and	O
a	O
new	O
Photos	O
app	O
aggregates	O
content	O
from	O
local	O
storage	O
and	O
OneDrive	B-Application
,	O
and	O
can	O
perform	O
automatic	O
enhancements	O
to	O
photos	O
.	O
</s>
<s>
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
supports	O
"	O
Continuum	O
"	O
,	O
a	O
feature	O
that	O
allows	O
supported	O
devices	O
to	O
connect	O
to	O
an	O
external	O
display	O
,	O
and	O
scale	O
its	O
user	O
interface	O
and	O
apps	O
into	O
a	O
"	O
PC-like	O
"	O
desktop	B-Application
interface	O
with	O
support	O
for	O
mouse	O
and	O
keyboard	O
input	O
over	O
USB	O
or	O
Bluetooth	O
.	O
</s>
<s>
Devices	O
can	O
connect	O
directly	O
to	O
external	O
displays	O
wirelessly	O
using	O
Miracast	O
,	O
via	O
USB-C	O
,	O
or	O
via	O
docking	B-Device
station	I-Device
accessories	O
with	O
USB	O
ports	O
,	O
as	O
well	O
as	O
HDMI	B-Protocol
and	O
DisplayPort	B-Protocol
outputs	O
.	O
</s>
<s>
A	O
new	O
iteration	O
of	O
the	O
Office	B-Application
Mobile	I-Application
suite	O
,	O
Office	O
for	O
Windows	B-Operating_System
10	I-Operating_System
,	O
is	O
also	O
bundled	O
.	O
</s>
<s>
Based	O
upon	O
the	O
Android	B-Application
and	O
iOS	B-Application
versions	O
of	O
Office	B-Application
Mobile	I-Application
,	O
they	O
introduce	O
a	O
new	O
user	O
interface	O
with	O
a	O
variation	O
of	O
the	O
ribbon	O
toolbar	O
used	O
by	O
the	O
desktop	B-Application
version	O
,	O
and	O
a	O
new	O
mobile	O
version	O
of	O
Outlook	B-Application
.	O
</s>
<s>
Outlook	B-Application
utilizes	O
the	O
same	O
rendering	O
engine	O
as	O
the	O
Windows	O
desktop	B-Application
version	O
of	O
Microsoft	B-Application
Word	I-Application
.	O
</s>
<s>
Microsoft	B-Application
Edge	I-Application
replaces	O
Internet	B-Application
Explorer	I-Application
Mobile	I-Application
as	O
the	O
default	O
web	O
browser	O
.	O
</s>
<s>
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
's	O
first-party	O
launch	O
devices	O
—	O
the	O
Lumia	B-Application
950	I-Application
,	O
Lumia	B-Device
950	I-Device
XL	I-Device
,	O
and	O
Lumia	B-Device
550	I-Device
—	O
were	O
released	O
in	O
November	O
2015	O
being	O
the	O
first	O
phones	O
to	O
ship	O
with	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
.	O
</s>
<s>
These	O
updates	O
are	O
distributed	O
to	O
all	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
devices	O
and	O
do	O
not	O
require	O
the	O
intervention	O
of	O
a	O
user	O
's	O
wireless	O
carrier	O
in	O
order	O
to	O
authorize	O
their	O
distribution	O
.	O
</s>
<s>
The	O
Windows	B-Application
Insider	I-Application
program	I-Application
,	O
adopted	O
to	O
provide	O
a	O
public	O
beta	O
for	O
the	O
PC	B-Device
version	O
of	O
Windows	B-Operating_System
10	I-Operating_System
,	O
is	O
used	O
to	O
provide	O
a	O
public	O
beta	O
version	O
of	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
for	O
selected	O
devices	O
.	O
</s>
<s>
A	O
build	O
released	O
on	O
April	O
10	O
,	O
2015	O
,	O
was	O
to	O
support	O
most	O
second	O
and	O
third	O
generation	O
Lumia	B-Device
products	O
,	O
but	O
the	O
Lumia	B-Application
930	I-Application
,	O
Lumia	B-Application
Icon	I-Application
,	O
and	O
Lumia	B-Application
640	I-Application
XL	I-Application
did	O
not	O
receive	O
the	O
update	O
due	O
to	O
scaling	O
bugs	O
,	O
and	O
delivery	O
was	O
suspended	O
as	O
a	O
whole	O
due	O
to	O
backup	O
and	O
restore	O
issues	O
on	O
some	O
models	O
.	O
</s>
<s>
An	O
update	O
to	O
the	O
Windows	B-Protocol
Phone	I-Protocol
Recovery	O
Tool	O
resolved	O
these	O
concerns	O
,	O
and	O
delivery	O
of	O
Windows	B-Operating_System
10	I-Operating_System
updates	O
was	O
restored	O
to	O
the	O
520	O
with	O
build	O
10052	O
,	O
and	O
to	O
the	O
640	B-Application
with	O
build	O
10080	O
.	O
</s>
<s>
Build	O
number	O
10136	O
was	O
released	O
on	O
June	O
16	O
,	O
2015	O
,	O
with	O
a	O
"	O
migration	O
bug	O
"	O
that	O
required	O
that	O
existing	O
devices	O
on	O
build	O
10080	O
be	O
reverted	O
to	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
using	O
the	O
Recovery	O
Tool	O
before	O
the	O
installation	O
of	O
10136	O
could	O
proceed	O
.	O
</s>
<s>
Mobile	O
builds	O
of	O
the	O
Redstone	O
branch	O
till	O
14322	O
were	O
halted	O
for	O
the	O
device	O
Lumia	B-Device
635	I-Device
(	O
1GB	O
RAM	O
)	O
due	O
to	O
bugs	O
.	O
</s>
<s>
Some	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
smartphones	B-Application
can	O
be	O
upgraded	O
to	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
,	O
pursuant	O
to	O
hardware	O
compatibility	O
,	O
manufacturer	O
support	O
,	O
and	O
carrier	O
support	O
.	O
</s>
<s>
Microsoft	O
originally	O
stated	O
that	O
stable	O
upgrades	O
for	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
devices	O
would	O
be	O
released	O
in	O
December	O
2015	O
;	O
however	O
,	O
the	O
release	O
was	O
ultimately	O
delayed	O
to	O
March	O
17	O
,	O
2016	O
.	O
</s>
<s>
Among	O
first-party	O
devices	O
,	O
only	O
the	O
Lumia	B-Application
430	I-Application
,	O
435	B-Device
,	O
532	B-Application
,	O
535	B-Application
,	O
540	B-Application
,	O
635	O
(	O
1GB	O
RAM	O
)	O
,	O
640	B-Application
,	O
640	B-Application
XL	I-Application
,	O
735	B-Application
,	O
830	B-Device
,	O
929	O
,	O
930	B-Application
and	O
1520	B-Application
are	O
supported	O
.	O
</s>
<s>
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
does	O
not	O
officially	O
support	O
any	O
HTC	B-Application
devices	O
(	O
HTC	B-Application
One	I-Application
M8	I-Application
for	I-Application
Windows	I-Application
,	O
HTC	B-Application
Windows	I-Application
Phone	I-Application
8X	I-Application
,	O
HTC	B-Application
Windows	I-Application
Phone	I-Application
8S	I-Application
)	O
,	O
although	O
the	O
HTC	B-Application
One	I-Application
M8	I-Application
for	I-Application
Windows	I-Application
could	O
be	O
upgraded	O
to	O
the	O
public	O
release	O
version	O
of	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
through	O
the	O
Windows	B-Application
Insider	I-Application
program	I-Application
.	O
</s>
<s>
While	O
Microsoft	O
stated	O
that	O
the	O
Nokia	B-Application
Lumia	I-Application
Icon	I-Application
may	O
be	O
upgraded	O
at	O
a	O
later	O
date	O
,	O
the	O
company	O
stated	O
that	O
there	O
will	O
not	O
be	O
a	O
second	O
wave	O
of	O
officially	O
supported	O
devices	O
.	O
</s>
<s>
Microsoft	O
also	O
removed	O
statements	O
which	O
promoted	O
the	O
BLU	O
Win	O
JR	O
LTE	O
as	O
being	O
compatible	O
with	O
Windows	B-Operating_System
10	I-Operating_System
.	O
</s>
<s>
Microsoft	O
originally	O
stated	O
that	O
all	O
Lumia	B-Device
smartphones	B-Application
running	O
Windows	B-Protocol
Phone	I-Protocol
8	O
and	O
8.1	B-Device
would	O
receive	O
updates	O
to	O
10	O
,	O
but	O
Microsoft	O
later	O
reiterated	O
that	O
only	O
devices	O
with	O
the	O
"	O
Lumia	B-Device
Denim	O
"	O
firmware	O
revision	O
and	O
at	O
least	O
8GB	O
of	O
internal	O
storage	O
would	O
receive	O
the	O
upgrade	O
.	O
</s>
<s>
In	O
February	O
2015	O
,	O
Joe	O
Belfiore	O
stated	O
that	O
Microsoft	O
was	O
working	O
on	O
support	O
for	O
devices	O
with	O
512MB	O
of	O
RAM	O
,	O
(	O
such	O
as	O
the	O
popular	O
Nokia	B-Device
Lumia	I-Device
520	I-Device
)	O
,	O
but	O
these	O
plans	O
have	O
since	O
been	O
dropped	O
.	O
</s>
<s>
Upon	O
the	O
official	O
upgrade	O
release	O
,	O
some	O
Lumia	B-Device
models	O
,	O
particularly	O
the	O
Lumia	B-Device
1020	I-Device
and	O
1320	B-Application
,	O
were	O
excluded	O
despite	O
meeting	O
the	O
previously	O
announced	O
criteria	O
.	O
</s>
<s>
On	O
October	O
17	O
,	O
2017	O
,	O
Nearly	O
2	O
years	O
after	O
the	O
Windows	B-Operating_System
10	I-Operating_System
release	O
,	O
Microsoft	O
released	O
an	O
Over-The-Cable	O
(	O
OTC	O
)	O
Updater	O
tool	O
to	O
bring	O
all	O
Lumias	O
up	O
to	O
date	O
to	O
the	O
latest	O
supported	O
Windows	B-Operating_System
10	I-Operating_System
build	O
,	O
even	O
older	O
512	O
MB	O
and	O
1	O
GB	O
RAM	O
unlocked	O
devices	O
such	O
as	O
the	O
520	O
,	O
620	O
,	O
720	O
,	O
925	O
,	O
920	O
etc	O
.	O
</s>
<s>
As	O
with	O
Windows	B-Protocol
Phone	I-Protocol
,	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
supports	O
ARM	B-Architecture
system-on-chips	O
from	O
Qualcomm	O
's	O
Snapdragon	B-Architecture
line	O
.	O
</s>
<s>
In	O
March	O
2015	O
,	O
Ars	O
Technica	O
reported	O
that	O
the	O
operating	O
system	O
will	O
also	O
introduce	O
support	O
for	O
IA-32	B-Device
system-on-chips	O
from	O
Intel	O
and	O
AMD	O
,	O
including	O
Intel	O
's	O
Atom	O
x3	O
and	O
Cherry	O
Trail	O
Atom	O
x5	O
and	O
x7	O
,	O
and	O
AMD	O
's	O
Carrizo	O
.	O
</s>
<s>
Minimum	O
specifications	O
for	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
devices	O
are	O
similar	O
to	O
those	O
of	O
Windows	B-Protocol
Phone	I-Protocol
8	O
,	O
with	O
a	O
minimum	O
screen	O
resolution	O
of	O
800×480	O
(	O
854×480	O
if	O
software	O
buttons	O
are	O
in	O
use	O
)	O
,	O
1GB	O
of	O
RAM	O
and	O
8GB	O
of	O
internal	O
storage	O
.	O
</s>
<s>
Owing	O
to	O
hardware	O
advancements	O
and	O
the	O
operating	O
system	O
's	O
support	O
for	O
tablets	B-Device
,	O
screen	O
resolutions	O
can	O
now	O
reach	O
as	O
high	O
as	O
QSXGA	O
resolution	O
(	O
2560×2048	O
)	O
and	O
further	O
,	O
as	O
opposed	O
to	O
the	O
1080p	O
cap	O
of	O
Windows	B-Protocol
Phone	I-Protocol
8	O
.	O
</s>
<s>
The	O
minimum	O
amount	O
of	O
RAM	O
required	O
is	O
dictated	O
by	O
the	O
screen	O
's	O
resolution	O
;	O
screens	O
with	O
a	O
resolution	O
800×480	O
or	O
960×540	O
and	O
higher	O
require	O
1GB	O
,	O
1920×1080	O
(	O
FHD	O
)	O
or	O
1440×900	O
and	O
higher	O
require	O
2GB	O
,	O
and	O
2560×1440	O
and	O
higher	O
require	O
3GB	O
.	O
</s>
<s>
Microsoft	O
unveiled	O
flagship	O
Lumia	B-Device
smartphones	B-Application
bundled	O
with	O
Windows	B-Operating_System
10	I-Operating_System
during	O
a	O
media	O
event	O
on	O
October	O
6	O
,	O
2015	O
,	O
including	O
Lumia	B-Application
950	I-Application
,	O
Lumia	B-Device
950	I-Device
XL	I-Device
,	O
and	O
the	O
low-end	O
Lumia	B-Device
550	I-Device
.	O
</s>
<s>
Microsoft	O
announced	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
during	O
their	O
January	O
21	O
,	O
2015	O
event	O
"	O
The	O
Next	O
Chapter	O
"	O
.	O
</s>
<s>
The	O
first	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
build	O
was	O
rolled	O
out	O
on	O
February	O
12	O
,	O
2015	O
,	O
as	O
part	O
of	O
the	O
Windows	B-Application
Insider	I-Application
Program	I-Application
to	O
a	O
subset	O
of	O
mobile	B-Device
devices	I-Device
running	I-Device
Windows	I-Device
Phone	I-Device
8	I-Device
and	O
8.1	B-Device
.	O
</s>
<s>
As	O
with	O
the	O
desktop	B-Application
editions	O
of	O
Windows	B-Operating_System
10	I-Operating_System
,	O
this	O
initial	O
release	O
was	O
codenamed	O
"	O
Threshold	O
"	O
,	O
it	O
was	O
part	O
of	O
both	O
the	O
"	O
Threshold	O
1	O
"	O
and	O
"	O
Threshold	O
2	O
"	O
development	O
cycles	O
.	O
</s>
<s>
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
launched	O
with	O
the	O
Microsoft	B-Device
Lumia	I-Device
550	I-Device
,	O
950	B-Application
and	O
950	B-Device
XL	I-Device
.	O
</s>
<s>
The	O
rollout	O
for	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
devices	O
started	O
March	O
17	O
,	O
2016	O
.	O
</s>
<s>
Like	O
the	O
start	O
of	O
the	O
previous	O
wave	O
,	O
the	O
first	O
builds	O
were	O
not	O
available	O
to	O
all	O
devices	O
that	O
were	O
included	O
in	O
the	O
Windows	B-Application
Insider	I-Application
Program	I-Application
.	O
</s>
<s>
The	O
Creators	O
Update	O
(	O
named	O
after	O
the	O
equivalent	O
update	O
to	O
Windows	B-Operating_System
10	I-Operating_System
for	O
PC	B-Device
)	O
,	O
also	O
known	O
as	O
Redstone	O
2	O
,	O
was	O
first	O
previewed	O
on	O
the	O
Insider	O
branch	O
on	O
August	O
17	O
,	O
2016	O
.	O
and	O
began	O
deployment	O
on	O
April	O
25	O
,	O
2017	O
.	O
</s>
<s>
It	O
features	O
mainly	O
minor	O
feature	O
additions	O
,	O
including	O
an	O
e-book	O
reader	O
within	O
Edge	O
,	O
the	O
ability	O
to	O
turn	O
off	O
the	O
phone	O
screen	O
when	O
using	O
Continuum	O
mode	O
on	O
an	O
external	O
display	O
,	O
SMS	B-Device
support	O
in	O
Skype	B-Application
,	O
SD	O
card	O
encryption	O
,	O
and	O
other	O
changes	O
.	O
</s>
<s>
Despite	O
the	O
platform	O
's	O
synergy	O
with	O
Windows	B-Operating_System
10	I-Operating_System
for	O
PCs	B-Device
,	O
some	O
of	O
its	O
features	O
(	O
such	O
as	O
Night	O
Light	O
and	O
Paint	O
3D	O
)	O
were	O
excluded	O
.	O
</s>
<s>
Around	O
the	O
time	O
that	O
the	O
Creators	O
Update	O
was	O
finalized	O
,	O
Windows	B-Application
Insider	I-Application
users	O
began	O
to	O
be	O
issued	O
updates	O
on	O
a	O
branch	O
known	O
as	O
feature2	O
.	O
</s>
<s>
Microsoft	O
stated	O
that	O
there	O
were	O
no	O
plans	O
to	O
move	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
to	O
be	O
in	O
sync	O
with	O
the	O
other	O
Windows	O
10-platforms	O
just	O
yet	O
;	O
media	O
outlets	O
considered	O
this	O
decision	O
to	O
be	O
a	O
sign	O
that	O
Microsoft	O
was	O
beginning	O
to	O
wind	O
down	O
active	O
development	O
of	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
beyond	O
maintenance	O
releases	O
,	O
as	O
development	O
was	O
no	O
longer	O
directly	O
in	O
sync	O
with	O
the	O
PC	B-Device
version	O
.	O
</s>
<s>
The	O
Creators	O
Update	O
was	O
only	O
offered	O
to	O
eleven	O
existing	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
devices	O
,	O
of	O
which	O
nine	O
would	O
later	O
receive	O
the	O
Fall	O
Creators	O
Update	O
:	O
</s>
<s>
In	O
early	O
June	O
2017	O
,	O
a	O
private	O
build	O
,	O
briefly	O
deployed	O
by	O
accident	O
by	O
Microsoft	O
,	O
revealed	O
work	O
on	O
an	O
updated	O
interface	O
for	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
known	O
as	O
"	O
CShell	O
"	O
(	O
"	O
composable	O
shell	O
"	O
)	O
,	O
an	O
implementation	O
of	O
the	O
Windows	B-Application
shell	I-Application
across	O
device	O
classes	O
using	O
a	O
modular	O
system	O
.	O
</s>
<s>
The	O
build	O
featured	O
a	O
Start	O
screen	O
,	O
Action	O
Center	O
,	O
and	O
Continuum	O
desktop	B-Application
interface	O
that	O
were	O
nearly	O
identical	O
in	O
functionality	O
and	O
appearance	O
to	O
their	O
equivalents	O
on	O
Windows	B-Operating_System
10	I-Operating_System
for	O
PC	B-Device
.	O
</s>
<s>
However	O
,	O
this	O
iteration	O
of	O
the	O
operating	O
system	O
was	O
no	O
longer	O
backwards	O
compatible	O
with	O
Windows	B-Protocol
Phone	I-Protocol
Silverlight	B-Application
apps	O
.	O
</s>
<s>
Reception	O
of	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
was	O
mixed	O
.	O
</s>
<s>
In	O
its	O
review	O
of	O
the	O
Lumia	B-Device
950	I-Device
XL	I-Device
,	O
The	O
Verge	O
felt	O
that	O
the	O
platform	O
was	O
"	O
buggy	O
and	O
unfinished	O
"	O
,	O
and	O
that	O
its	O
user	O
interface	O
was	O
inconsistent	O
in	O
operation	O
and	O
felt	O
more	O
like	O
Android	B-Application
mixed	O
with	O
few	O
of	O
the	O
distinct	O
design	O
elements	O
that	O
were	O
hallmarks	O
of	O
Windows	B-Protocol
Phone	I-Protocol
.	O
</s>
<s>
It	O
was	O
noted	O
that	O
the	O
OS	O
still	O
retained	O
much	O
of	O
the	O
performance	O
of	O
Windows	B-Protocol
Phone	I-Protocol
8	O
,	O
and	O
that	O
Microsoft	O
had	O
made	O
efforts	O
to	O
create	O
synergies	O
with	O
the	O
PC	B-Device
version	O
of	O
Windows	B-Operating_System
10	I-Operating_System
via	O
its	O
universal	O
apps	O
concept	O
.	O
</s>
<s>
Continuum	O
was	O
regarded	O
as	O
potentially	O
being	O
a	O
signature	O
feature	O
over	O
time	O
,	O
but	O
that	O
it	O
was	O
merely	O
a	O
"	O
parlor	O
trick	O
"	O
in	O
its	O
launch	O
state	O
due	O
to	O
a	O
lack	O
of	O
support	O
for	O
desktop-oriented	O
interfaces	O
among	O
third-party	O
software	O
.	O
</s>
<s>
TechRadar	O
felt	O
that	O
the	O
lack	O
of	O
apps	O
was	O
the	O
"	O
biggest	O
let-down	O
on	O
Windows	B-Protocol
Phone	I-Protocol
and	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
alike.	O
"	O
</s>
<s>
After	O
many	O
user	O
complaints	O
,	O
Microsoft	O
started	O
allowing	O
users	O
to	O
downgrade	O
from	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
to	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
.	O
</s>
<s>
On	O
October	O
8	O
,	O
2017	O
,	O
Microsoft	O
executive	O
Joe	O
Belfiore	O
revealed	O
that	O
the	O
company	O
would	O
no	O
longer	O
actively	O
develop	O
new	O
features	O
or	O
hardware	O
for	O
Windows	B-Protocol
phones	I-Protocol
,	O
citing	O
its	O
low	O
market	O
share	O
,	O
and	O
the	O
resultant	O
lack	O
of	O
third-party	O
software	O
for	O
the	O
platform	O
.	O
</s>
<s>
Microsoft	O
had	O
largely	O
abandoned	O
its	O
mobile	O
business	O
,	O
having	O
laid	O
off	O
the	O
majority	O
of	O
Microsoft	O
Mobile	O
employees	O
in	O
2016	O
,	O
sold	O
a	O
number	O
of	O
intellectual	O
property	O
and	O
manufacturing	O
assets	O
(	O
including	O
,	O
in	O
particular	O
,	O
the	O
Nokia	O
feature	B-Device
phone	I-Device
business	O
)	O
to	O
HMD	O
Global	O
and	O
Foxconn	O
(	O
which	O
began	O
producing	O
Android-based	O
smartphones	B-Application
under	O
the	O
Nokia	O
brand	O
)	O
focused	O
software	O
efforts	O
on	O
providing	O
apps	O
and	O
services	O
compatible	O
with	O
the	O
incumbent	O
Android	B-Application
and	O
iOS	B-Application
instead	O
,	O
and	O
having	O
since	O
released	O
dual-touchscreen	B-Device
Android	B-Application
smartphones	B-Application
under	O
the	O
Surface	B-Application
Duo	I-Application
brand	O
.	O
</s>
<s>
Development	O
of	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
would	O
be	O
limited	O
to	O
maintenance	O
releases	O
and	O
patches	O
.	O
</s>
<s>
By	O
December	O
2018	O
,	O
Statcounter	O
had	O
reported	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
's	O
market	O
share	O
to	O
be	O
0.33	O
%	O
.	O
</s>
<s>
In	O
January	O
2019	O
,	O
Microsoft	O
announced	O
that	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
would	O
reach	O
end	O
of	O
life	O
on	O
December	O
10	O
,	O
2019	O
,	O
after	O
which	O
no	O
further	O
security	O
updates	O
will	O
be	O
released	O
,	O
and	O
online	O
services	O
tied	O
to	O
the	O
OS	O
(	O
such	O
as	O
device	O
backup	O
)	O
have	O
begun	O
to	O
be	O
phased	O
out	O
.	O
</s>
<s>
However	O
,	O
Microsoft	O
quietly	O
moved	O
the	O
EOL	O
date	O
to	O
January	O
14	O
,	O
2020	O
(	O
aligned	O
with	O
the	O
EOL	O
date	O
for	O
Windows	B-Device
7	I-Device
,	O
Windows	O
Server	O
2008/R2	O
and	O
Internet	B-Application
Explorer	I-Application
10	I-Application
)	O
with	O
one	O
additional	O
security	O
update	O
released	O
.	O
</s>
