<s>
The	O
Nokia	B-Application
X	I-Application
platform	I-Application
was	O
a	O
Linux-based	O
mobile	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
and	O
software	B-Device
platform	I-Device
originally	O
developed	O
by	O
Nokia	O
,	O
and	O
subsequently	O
by	O
Microsoft	O
Mobile	O
.	O
</s>
<s>
Introduced	O
on	O
24	O
February	O
2014	O
,	O
it	O
was	O
forked	B-Application
from	O
Android	B-Application
and	O
used	O
on	O
all	O
the	O
devices	O
of	O
the	O
Nokia	B-Device
X	I-Device
family	I-Device
.	O
</s>
<s>
It	O
was	O
also	O
the	O
next	O
Nokia	O
Linux	B-Operating_System
project	O
after	O
the	O
ill-fated	O
MeeGo	B-Operating_System
.	O
</s>
<s>
On	O
17	O
July	O
2014	O
,	O
after	O
the	O
acquisition	O
of	O
Nokia	O
's	O
devices	O
unit	O
,	O
Microsoft	O
announced	O
that	O
no	O
more	O
Nokia	B-Device
X	I-Device
smartphones	I-Device
will	O
be	O
introduced	O
,	O
marking	O
the	O
end	O
of	O
the	O
Nokia	B-Application
X	I-Application
platform	I-Application
within	O
only	O
a	O
few	O
months	O
after	O
its	O
introduction	O
.	O
</s>
<s>
The	O
phones	O
were	O
succeeded	O
by	O
low-cost	O
Lumia	B-Device
devices	O
under	O
the	O
Microsoft	O
Mobile	O
brand	O
name	O
.	O
</s>
<s>
Microsoft	O
did	O
not	O
release	O
an	O
Android-based	O
device	O
under	O
their	O
own	O
brand	O
until	O
2020	O
,	O
in	O
the	O
form	O
of	O
the	O
foldable	B-Application
Surface	B-Application
Duo	I-Application
.	O
</s>
<s>
The	O
Nokia	B-Application
X	I-Application
software	I-Application
platform	I-Application
was	O
based	O
on	O
the	O
Android	B-Application
Open	B-Application
Source	I-Application
Project	O
(	O
AOSP	O
)	O
and	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
.	O
</s>
<s>
Nokia	O
combined	O
Android	B-Application
apps	O
with	O
Nokia	O
experiences	O
(	O
such	O
as	O
HERE	B-Application
Maps	I-Application
,	O
Nokia	B-Application
Xpress	I-Application
and	O
MixRadio	B-Language
)	O
and	O
Microsoft	O
services	O
(	O
such	O
as	O
Skype	B-Application
and	O
Outlook	B-Application
)	O
.	O
</s>
<s>
It	O
also	O
encompasses	O
features	O
from	O
the	O
Asha	B-Operating_System
platform	I-Operating_System
,	O
such	O
as	O
the	O
Fastlane	O
notification	O
centre	O
.	O
</s>
<s>
The	O
user	O
interface	O
mimics	O
that	O
of	O
Windows	B-Protocol
Phone	I-Protocol
.	O
</s>
<s>
The	O
OS	O
has	O
been	O
compared	O
to	O
com	O
's	O
Fire	B-Application
OS	I-Application
,	O
which	O
is	O
also	O
based	O
on	O
AOSP	O
.	O
</s>
<s>
Google	B-Application
's	I-Application
applications	O
were	O
replaced	O
by	O
Nokia	O
's	O
and	O
Microsoft	O
's	O
.	O
</s>
<s>
When	O
first	O
released	O
,	O
the	B-Application
Google	I-Application
Play	O
store	O
was	O
not	O
included	O
,	O
with	O
Nokia	O
offering	O
apps	O
from	O
their	O
own	O
Nokia	B-Application
Store	I-Application
.	O
</s>
<s>
After	O
the	O
v2.1	O
update	O
in	O
September	O
2014	O
users	O
were	O
allowed	O
to	O
install	O
Google	B-Application
Play	I-Application
and	O
various	O
other	O
Google	B-Application
services	O
through	O
third	O
party	O
tools	O
,	O
but	O
if	O
users	O
attempt	O
to	O
install	O
Google	B-Application
services	O
on	O
their	O
Nokia	O
X	O
devices	O
it	O
would	O
usually	O
be	O
"	O
bricked	O
"	O
and	O
would	O
require	O
the	O
Nokia	O
Software	O
Recovery	O
Tool	O
to	O
restore	O
the	O
data	O
.	O
</s>
<s>
As	O
of	O
February	O
2014	O
,	O
75%	O
of	O
Android	B-Application
apps	O
were	O
compatible	O
with	O
the	O
platform	O
.	O
</s>
<s>
Nokia	O
noted	O
that	O
developers	O
could	O
port	O
the	O
remaining	O
missing	O
apps	O
in	O
a	O
matter	O
of	O
hours	O
,	O
and	O
in	O
an	O
attempt	O
to	O
encourage	O
developers	O
to	O
contribute	O
to	O
the	O
platform	O
,	O
added	O
compatible	O
Android	B-Application
apps	O
without	O
developer	O
approval	O
.	O
</s>
<s>
An	O
SDK	B-Application
was	O
available	O
for	O
the	O
platform	O
,	O
and	O
included	O
an	O
emulator	O
based	O
on	O
the	O
Android	B-Application
emulator	O
.	O
</s>
<s>
Nokia	O
discouraged	O
developers	O
from	O
using	O
Windows	B-Protocol
Phone	I-Protocol
design	O
patterns	O
and	O
encouraged	O
the	O
use	O
of	O
Android	B-Application
design	O
guidelines	O
on	O
the	O
Nokia	O
X	O
.	O
Nokia	O
's	O
VP	O
of	O
developer	O
relations	O
commented	O
that	O
the	O
Nokia	O
imaging	O
SDK	B-Application
would	O
likely	O
be	O
ported	O
to	O
the	O
platform	O
from	O
Windows	B-Protocol
Phone	I-Protocol
.	O
</s>
