<s>
Outlook.com,	O
formerly	O
named	O
Hotmail	B-Operating_System
,	O
is	O
a	O
webmail	B-Protocol
service	O
that	O
is	O
part	O
of	O
the	O
Microsoft	B-Operating_System
365	I-Operating_System
product	O
family	O
.	O
</s>
<s>
It	O
offers	O
mail	B-Protocol
,	O
calendaring	B-Application
,	O
contacts	B-Operating_System
,	O
and	O
tasks	O
services	O
.	O
</s>
<s>
Founded	O
in	O
1996	O
by	O
Sabeer	O
Bhatia	O
and	O
Jack	O
Smith	O
as	O
Hotmail	B-Operating_System
,	O
it	O
was	O
acquired	O
by	O
Microsoft	O
in	O
1997	O
for	O
an	O
estimated	O
$400	O
million	O
and	O
relaunched	O
as	O
MSN	B-Operating_System
Hotmail	I-Operating_System
,	O
later	O
rebranded	O
to	O
Windows	B-Operating_System
Live	I-Operating_System
Hotmail	I-Operating_System
as	O
part	O
of	O
the	O
Windows	O
Live	O
suite	O
of	O
products	O
.	O
</s>
<s>
Microsoft	O
phased	O
out	O
Hotmail	B-Operating_System
in	O
October	O
2011	O
,	O
relaunching	O
the	O
service	O
as	O
Outlook.com	B-Operating_System
in	O
2012	O
.	O
</s>
<s>
Hotmail	B-Operating_System
service	O
was	O
founded	O
by	O
Sabeer	O
Bhatia	O
and	O
Jack	O
Smith	O
,	O
and	O
was	O
one	O
of	O
the	O
first	O
webmail	B-Protocol
services	O
on	O
the	O
Internet	O
along	O
with	O
Four11	B-Application
's	I-Application
RocketMail	I-Application
(	O
later	O
Yahoo	O
!	O
</s>
<s>
Mail	B-Protocol
)	O
.	O
</s>
<s>
The	O
name	O
"	O
Hotmail	B-Operating_System
"	O
was	O
chosen	O
out	O
of	O
many	O
possibilities	O
ending	O
in	O
"	O
-mail	O
"	O
as	O
it	O
included	O
the	O
letters	O
HTML	B-Language
,	O
the	O
markup	O
language	O
used	O
to	O
create	O
web	O
pages	O
(	O
to	O
emphasize	O
this	O
,	O
the	O
original	O
type	O
casing	O
was	O
"	O
HoTMaiL	B-Operating_System
"	O
)	O
.	O
</s>
<s>
Hotmail	B-Operating_System
was	O
initially	O
backed	O
by	O
venture	O
capital	O
firm	O
Draper	O
Fisher	O
Jurvetson	O
.	O
</s>
<s>
Hotmail	B-Operating_System
initially	O
ran	O
under	O
Solaris	B-Application
for	O
mail	B-Protocol
services	O
and	O
Apache	B-Application
on	O
FreeBSD	B-Operating_System
for	O
web	O
services	O
,	O
before	O
being	O
partly	O
converted	O
to	O
Microsoft	O
products	O
,	O
using	O
Windows	O
Services	O
for	O
UNIX	O
in	O
the	O
migration	O
path	O
.	O
</s>
<s>
Hotmail	B-Operating_System
was	O
sold	O
to	O
Microsoft	O
in	O
December	O
1997	O
for	O
a	O
reported	O
$400	O
million	O
,	O
and	O
it	O
joined	O
the	O
MSN	B-Protocol
group	O
of	O
services	O
.	O
</s>
<s>
Hotmail	B-Operating_System
quickly	O
gained	O
in	O
popularity	O
as	O
it	O
was	O
localized	B-General_Concept
for	O
different	O
markets	O
around	O
the	O
globe	O
,	O
and	O
became	O
the	O
world	O
's	O
largest	O
webmail	B-Protocol
service	O
with	O
more	O
than	O
30	O
million	O
active	O
members	O
reported	O
by	O
February	O
1999	O
.	O
</s>
<s>
Hotmail	B-Operating_System
originally	O
ran	O
on	O
a	O
mixture	O
of	O
FreeBSD	B-Operating_System
and	O
Solaris	B-Application
operating	I-Application
systems	I-Application
.	O
</s>
<s>
A	O
project	O
was	O
started	O
to	O
move	O
Hotmail	B-Operating_System
to	O
Windows	O
2000	O
.	O
</s>
<s>
In	O
June	O
2001	O
,	O
Microsoft	O
claimed	O
this	O
had	O
been	O
completed	O
;	O
a	O
few	O
days	O
later	O
they	O
retracted	O
the	O
statement	O
and	O
admitted	O
that	O
the	O
DNS	O
functions	O
of	O
the	O
Hotmail	B-Operating_System
system	O
were	O
still	O
reliant	O
on	O
FreeBSD	B-Operating_System
.	O
</s>
<s>
In	O
2002	O
Hotmail	B-Operating_System
still	O
ran	O
its	O
infrastructure	O
on	O
UNIX	O
servers	O
,	O
with	O
only	O
the	O
front-end	O
converted	O
to	O
Windows	O
2000	O
.	O
</s>
<s>
Later	O
development	O
saw	O
the	O
service	O
tied	O
with	O
Microsoft	O
's	O
web	O
authentication	O
scheme	O
,	O
Microsoft	O
Passport	O
(	O
now	O
Microsoft	O
account	O
)	O
,	O
and	O
integration	O
with	O
Microsoft	O
's	O
instant	B-Application
messaging	I-Application
and	O
social	O
networking	O
programs	O
,	O
MSN	B-Protocol
Messenger	I-Protocol
and	O
MSN	B-Protocol
Spaces	O
(	O
later	O
Windows	B-Protocol
Live	I-Protocol
Messenger	I-Protocol
and	O
Windows	O
Live	O
Spaces	O
,	O
respectively	O
)	O
.	O
</s>
<s>
In	O
1999	O
,	O
hackers	O
revealed	O
a	O
security	O
flaw	O
in	O
Hotmail	B-Operating_System
that	O
permitted	O
anybody	O
to	O
log	O
in	O
to	O
any	O
Hotmail	B-Operating_System
account	O
using	O
the	O
password	O
'	O
eh	O
 '	O
.	O
</s>
<s>
In	O
2001	O
,	O
the	O
Hotmail	B-Operating_System
service	O
was	O
compromised	O
again	O
by	O
computer	O
hackers	O
who	O
discovered	O
that	O
anyone	O
could	O
log	O
in	O
to	O
their	O
Hotmail	B-Operating_System
account	O
and	O
then	O
pull	O
messages	O
from	O
any	O
other	O
Hotmail	B-Operating_System
account	O
by	O
crafting	O
a	O
URL	O
with	O
the	O
second	O
account	O
's	O
username	O
and	O
a	O
valid	O
message	O
number	O
.	O
</s>
<s>
It	O
was	O
such	O
a	O
simple	O
attack	O
that	O
by	O
the	O
time	O
the	O
patch	O
was	O
made	O
,	O
dozens	O
of	O
newspapers	O
and	O
hundreds	O
of	O
web	O
sites	O
published	O
exact	O
descriptions	O
allowing	O
tens	O
of	O
thousands	O
of	O
hackers	O
to	O
run	O
rampant	O
across	O
Hotmail	B-Operating_System
.	O
</s>
<s>
In	O
2004	O
,	O
Google	B-Application
announced	O
its	O
own	O
mail	B-Protocol
service	O
,	O
Gmail	B-Application
.	O
</s>
<s>
Featuring	O
greater	O
storage	O
space	O
,	O
speed	O
,	O
and	O
interface	O
flexibility	O
,	O
this	O
new	O
competitor	O
spurred	O
a	O
wave	O
of	O
innovation	O
in	O
webmail	B-Protocol
.	O
</s>
<s>
The	O
main	O
industry	O
heavyweights	O
–	O
Hotmail	B-Operating_System
and	O
Yahoo	O
!	O
</s>
<s>
Mail	B-Protocol
–	O
introduced	O
upgraded	O
versions	O
of	O
their	O
email	O
services	O
with	O
greater	O
speed	O
,	O
security	O
,	O
and	O
advanced	O
features	O
.	O
</s>
<s>
Other	O
webmail	B-Protocol
enthusiasts	O
also	O
wanting	O
to	O
try	O
the	O
beta	O
version	O
could	O
request	O
an	O
invitation	O
granting	O
access	O
.	O
</s>
<s>
The	O
Hotmail	B-Operating_System
brand	O
was	O
planned	O
to	O
be	O
phased-out	O
when	O
Microsoft	O
announced	O
that	O
the	O
new	O
mail	B-Protocol
system	O
would	O
be	O
called	O
Windows	B-Application
Live	I-Application
Mail	I-Application
,	O
but	O
the	O
developers	O
soon	O
backtracked	O
after	O
beta-testers	O
were	O
confused	O
with	O
the	O
name	O
change	O
and	O
preferred	O
the	O
already	O
well-known	O
Hotmail	B-Operating_System
name	O
,	O
and	O
decided	O
on	O
Windows	B-Operating_System
Live	I-Operating_System
Hotmail	I-Operating_System
.	O
</s>
<s>
Development	O
of	O
the	O
beta	O
was	O
finished	O
in	O
April	O
2007	O
,	O
Windows	B-Operating_System
Live	I-Operating_System
Hotmail	I-Operating_System
was	O
released	O
to	O
new	O
registrations	O
on	O
May	O
7	O
,	O
2007	O
,	O
as	O
the	O
260	O
million	O
MSN	B-Operating_System
Hotmail	I-Operating_System
accounts	O
worldwide	O
gained	O
access	O
to	O
the	O
new	O
system	O
.	O
</s>
<s>
The	O
old	O
MSN	B-Operating_System
Hotmail	I-Operating_System
interface	O
was	O
accessible	O
only	O
by	O
users	O
who	O
registered	O
before	O
the	O
Windows	B-Operating_System
Live	I-Operating_System
Hotmail	I-Operating_System
release	O
date	O
and	O
had	O
not	O
chosen	O
to	O
update	O
to	O
the	O
new	O
service	O
.	O
</s>
<s>
Windows	B-Operating_System
Live	I-Operating_System
Hotmail	I-Operating_System
was	O
awarded	O
PC	O
Magazines	O
Editor	O
's	O
Choice	O
Award	O
in	O
February	O
2007	O
,	O
March	O
2007	O
,	O
and	O
February	O
2011	O
.	O
</s>
<s>
The	O
classic	O
and	O
full	O
versions	O
of	O
Windows	B-Operating_System
Live	I-Operating_System
Hotmail	I-Operating_System
were	O
combined	O
in	O
the	O
new	O
release	O
.	O
</s>
<s>
As	O
a	O
result	O
of	O
user	O
feedback	O
,	O
Hotmail	B-Operating_System
was	O
updated	O
so	O
that	O
scrolling	O
works	O
for	O
users	O
who	O
have	O
the	O
reading	O
pane	O
turned	O
off	O
.	O
</s>
<s>
It	O
was	O
also	O
expected	O
that	O
Hotmail	B-Operating_System
team	O
would	O
be	O
moving	O
the	O
advertisement	O
from	O
the	O
top	O
of	O
page	O
to	O
the	O
side	O
,	O
adding	O
more	O
themes	O
,	O
increasing	O
the	O
number	O
of	O
messages	O
on	O
each	O
page	O
and	O
adding	O
the	O
ability	O
to	O
send	O
instant	B-Application
messages	I-Application
from	O
the	O
user	O
's	O
inbox	O
in	O
future	O
releases	O
.	O
</s>
<s>
Support	O
for	O
Firefox	B-Application
in	O
the	O
upgraded	O
Windows	B-Operating_System
Live	I-Operating_System
Hotmail	I-Operating_System
took	O
a	O
few	O
months	O
to	O
complete	O
.	O
</s>
<s>
By	O
2009	O
,	O
support	O
for	O
Google	B-Application
Chrome	I-Application
was	O
still	O
incomplete	O
,	O
prompting	O
the	O
Chrome	B-Application
developers	O
to	O
temporarily	O
ship	O
a	O
browser	B-Application
that	O
employed	O
user	O
agent	O
spoofing	O
when	O
making	O
requests	O
to	O
the	O
Windows	O
Live	O
site	O
.	O
</s>
<s>
As	O
part	O
of	O
the	O
update	O
,	O
Microsoft	O
also	O
added	O
integrated	O
capability	O
for	O
instant	B-Application
messaging	I-Application
with	O
contacts	B-Operating_System
on	O
the	O
Windows	B-Protocol
Live	I-Protocol
Messenger	I-Protocol
service	O
.	O
</s>
<s>
The	O
feature	O
was	O
the	O
realization	O
of	O
a	O
project	O
that	O
began	O
as	O
"	O
Windows	O
Live	O
Web	B-Application
Messenger	I-Application
"	O
in	O
2007	O
,	O
a	O
replacement	O
for	O
the	O
outdated	O
"	O
MSN	B-Protocol
Web	B-Application
Messenger	I-Application
"	O
service	O
that	O
was	O
first	O
introduced	O
in	O
August	O
2004	O
.	O
</s>
<s>
It	O
was	O
noted	O
that	O
the	O
original	O
"	O
Windows	O
Live	O
Web	B-Application
Messenger	I-Application
"	O
featured	O
tabbed	O
conversations	O
in	O
a	O
"	O
conversation	O
workspace	O
"	O
,	O
however	O
since	O
its	O
integration	O
with	O
Hotmail	B-Operating_System
this	O
has	O
been	O
removed	O
.	O
</s>
<s>
Microsoft	O
's	O
search	B-Application
engine	I-Application
Bing	B-Application
was	O
integrated	O
into	O
Hotmail	B-Operating_System
in	O
2009	O
through	O
the	O
introduction	O
of	O
a	O
"	O
Quick	O
Add	O
"	O
feature	O
,	O
allowing	O
users	O
to	O
add	O
search	B-Application
results	I-Application
from	O
Bing	B-Application
into	O
emails	O
.	O
</s>
<s>
On	O
May	O
18	O
,	O
2010	O
,	O
Microsoft	O
unveiled	O
the	O
"	O
Wave	O
4	O
"	O
update	O
of	O
Hotmail	B-Operating_System
,	O
which	O
offered	O
features	O
such	O
as	O
1-click	O
filters	O
,	O
active	O
views	O
,	O
inbox	O
sweeping	O
,	O
and	O
10	O
GB	O
space	O
for	O
photos	O
,	O
Microsoft	O
Office	O
documents	O
,	O
and	O
attachments	O
.	O
</s>
<s>
It	O
also	O
included	O
integration	O
with	O
Windows	B-Application
Live	I-Application
SkyDrive	I-Application
and	O
Windows	O
Live	O
Office	O
,	O
a	O
free	O
version	O
of	O
Microsoft	O
's	O
Office	O
Web	B-Application
Apps	I-Application
suite	O
.	O
</s>
<s>
The	O
new	O
version	O
began	O
its	O
gradual	O
release	O
to	O
all	O
Hotmail	B-Operating_System
users	O
on	O
June	O
15	O
,	O
2010	O
and	O
was	O
completely	O
rolled	O
out	O
on	O
August	O
3	O
,	O
2010	O
.	O
</s>
<s>
Exchange	B-Protocol
ActiveSync	I-Protocol
support	O
was	O
enabled	O
to	O
all	O
Hotmail	B-Operating_System
users	O
on	O
August	O
30	O
,	O
2010	O
,	O
allowing	O
users	O
to	O
sync	O
their	O
mail	B-Protocol
,	O
contacts	B-Operating_System
,	O
calendar	B-Protocol
and	O
tasks	O
to	O
their	O
mobile	O
devices	O
that	O
supports	O
the	O
protocol	O
.	O
</s>
<s>
Addition	O
of	O
full-session	O
SSL	B-Protocol
was	O
released	O
on	O
November	O
9	O
,	O
2010	O
.	O
</s>
<s>
Throughout	O
2011	O
,	O
Microsoft	O
added	O
several	O
new	O
features	O
to	O
Hotmail	B-Operating_System
,	O
such	O
as	O
aliases	O
and	O
speed	O
improvements	O
.	O
</s>
<s>
In	O
October	O
2011	O
,	O
Microsoft	O
unveiled	O
a	O
"	O
re-invented	O
Hotmail	B-Operating_System
"	O
,	O
and	O
added	O
many	O
new	O
features	O
such	O
as	O
Instant	O
Actions	O
,	O
scheduled	O
Sweep	O
,	O
and	O
Categories	O
and	O
this	O
update	O
began	O
fully	O
rolling	O
out	O
on	O
November	O
9	O
,	O
2011	O
.	O
</s>
<s>
This	O
update	O
also	O
made	O
SSL	B-Protocol
enabled	O
by	O
default	O
on	O
all	O
accounts	O
.	O
</s>
<s>
Outlook.com	B-Operating_System
was	O
first	O
introduced	O
on	O
July	O
31	O
,	O
2012	O
,	O
when	O
its	O
beta	O
version	O
was	O
made	O
available	O
to	O
the	O
general	O
public	O
.	O
</s>
<s>
Existing	O
Hotmail	B-Operating_System
customers	O
could	O
freely	O
upgrade	O
to	O
the	O
preview	O
version	O
of	O
Outlook.com	B-Operating_System
and	O
downgrade	O
back	O
.	O
</s>
<s>
Outlook.com	B-Operating_System
graduated	O
preview	O
stage	O
on	O
February	O
18	O
,	O
2013	O
.	O
</s>
<s>
According	O
to	O
Microsoft	O
,	O
the	O
upgrade	O
was	O
deployed	O
on	O
April	O
3	O
,	O
2013	O
;	O
users	O
kept	O
their	O
existing	O
Hotmail	B-Operating_System
accounts	O
and	O
received	O
the	O
option	O
of	O
having	O
an	O
@outlook	B-Operating_System
.com	I-Operating_System
email	O
address	O
.	O
</s>
<s>
By	O
May	O
2013	O
,	O
the	O
upgrade	O
was	O
completed	O
and	O
Outlook.com	B-Operating_System
had	O
400	O
million	O
active	O
users	O
.	O
</s>
<s>
By	O
May	O
2014	O
,	O
Outlook.com	B-Operating_System
continued	O
to	O
have	O
400	O
million	O
active	O
users	O
.	O
</s>
<s>
This	O
was	O
followed	O
in	O
June	O
2015	O
by	O
the	O
introduction	O
through	O
an	O
opt-in	O
preview	O
of	O
new	O
features	O
,	O
including	O
new	O
calendar	B-Protocol
layout	O
options	O
,	O
a	O
filtering	O
service	O
called	O
"	O
Clutter	O
"	O
and	O
new	O
theme	O
designs	O
.	O
</s>
<s>
Microsoft	O
also	O
introduced	O
the	O
ability	O
for	O
third-party	O
providers	O
such	O
as	O
PayPal	O
and	O
Evernote	B-Application
to	O
include	O
add-ins	O
into	O
the	O
service	O
.	O
</s>
<s>
Additionally	O
,	O
contact	O
suggestions	O
and	O
updates	O
from	O
emails	O
such	O
as	O
flight	O
reservations	O
are	O
due	O
to	O
be	O
introduced	O
to	O
Office	B-Operating_System
365	I-Operating_System
subscribers	O
 '	O
accounts	O
and	O
Outlook.com	B-Operating_System
users	O
 '	O
from	O
January	O
and	O
March	O
2016	O
respectively	O
.	O
</s>
<s>
With	O
the	O
upgrade	O
,	O
users	O
were	O
no	O
longer	O
able	O
to	O
use	O
the	O
Windows	B-Application
Live	I-Application
Mail	I-Application
2012	O
client	O
to	O
synchronize	O
their	O
email	O
,	O
contacts	B-Operating_System
and	O
calendar	B-Protocol
event	O
using	O
the	O
official	O
settings	O
;	O
they	O
were	O
encouraged	O
to	O
view	O
Outlook.com	B-Operating_System
through	O
a	O
web	B-Application
browser	I-Application
,	O
through	O
the	O
Mail	B-Protocol
app	O
,	O
or	O
through	O
the	O
Microsoft	B-Application
Outlook	I-Application
client	O
.	O
</s>
<s>
However	O
,	O
Windows	B-Application
Live	I-Application
Mail	I-Application
could	O
be	O
configured	O
to	O
use	O
the	O
IMAP	B-Protocol
protocol	O
(	O
or	O
the	O
less	O
effective	O
POP3	B-Protocol
)	O
to	O
fetch	O
mail	B-Protocol
only	O
.	O
</s>
<s>
On	O
August	O
8	O
,	O
2017	O
,	O
Microsoft	O
launched	O
a	O
new	O
opt-in	O
beta	O
toggle	O
allowing	O
users	O
to	O
test	O
upcoming	O
changes	O
to	O
the	O
Outlook.com	B-Operating_System
Mail	B-Protocol
,	O
including	O
a	O
faster	O
inbox	O
,	O
a	O
responsive	O
design	O
,	O
and	O
the	O
ability	O
to	O
search	B-Application
for	O
emojis	O
.	O
</s>
<s>
There	O
was	O
also	O
an	O
introduction	O
of	O
the	O
Photos	O
Hub	O
,	O
the	O
fifth	O
component	O
of	O
Outlook.com	B-Operating_System
.	O
</s>
<s>
On	O
October	O
30	O
,	O
2017	O
,	O
Microsoft	O
announced	O
that	O
it	O
would	O
phase	O
out	O
its	O
"	O
Outlook.com	B-Operating_System
Premium	O
"	O
subscription	O
service	O
,	O
which	O
offered	O
features	O
such	O
as	O
expanded	O
storage	O
and	O
removal	O
of	O
ads	O
from	O
the	O
user	O
interface	O
.	O
</s>
<s>
These	O
benefits	O
were	O
subsequently	O
made	O
available	O
to	O
Office	B-Operating_System
365	I-Operating_System
subscribers	O
,	O
and	O
Microsoft	O
will	O
no	O
longer	O
accept	O
new	O
subscriptions	O
to	O
Outlook.com	B-Operating_System
Premium	O
.	O
</s>
<s>
Existing	O
Outlook.com	B-Operating_System
Premium	O
subscribers	O
may	O
continue	O
to	O
renew	O
their	O
existing	O
subscription	O
.	O
</s>
<s>
Similar	O
to	O
other	O
major	O
webmail	B-Protocol
services	O
,	O
Outlook.com	B-Operating_System
uses	O
Ajax	B-General_Concept
programming	I-General_Concept
techniques	O
and	O
supports	O
later	O
versions	O
of	O
Internet	B-Application
Explorer	I-Application
,	O
Firefox	B-Application
,	O
Safari	B-Application
,	O
and	O
Google	B-Application
Chrome	I-Application
.	O
</s>
<s>
Some	O
of	O
its	O
features	O
include	O
keyboard	B-Device
controls	O
giving	O
the	O
ability	O
to	O
navigate	O
around	O
the	O
page	O
without	O
using	O
the	O
mouse	B-Device
,	O
the	O
ability	O
to	O
search	B-Application
the	O
user	O
's	O
messages	O
including	O
structured	O
query	O
syntax	O
such	O
as	O
"	O
from:ebay	O
"	O
,	O
message	O
filters	O
,	O
folder-based	O
organization	O
of	O
messages	O
,	O
auto-completion	O
of	O
contact	O
addresses	O
when	O
composing	O
,	O
contact	O
grouping	O
,	O
importing	O
and	O
exporting	O
of	O
contacts	B-Operating_System
as	O
CSV	O
files	O
,	O
rich	O
text	O
formatting	O
,	O
rich	O
text	O
signatures	O
,	O
spam	O
filtering	O
and	O
virus	O
scanning	O
,	O
support	O
for	O
multiple	O
addresses	O
,	O
and	O
different	O
language	O
versions	O
.	O
</s>
<s>
Outlook.com	B-Operating_System
has	O
promised	O
to	O
respect	O
users	O
 '	O
privacy	O
,	O
specifically	O
targeting	O
Gmail	B-Application
's	O
privacy	O
practices	O
.	O
</s>
<s>
Outlook.com	B-Operating_System
does	O
not	O
scan	O
emails	O
or	O
attachments	O
for	O
advertising	O
information	O
and	O
personal	O
conversations	O
are	O
ad-free	O
entirely	O
.	O
</s>
<s>
Outlook.com	B-Operating_System
uses	O
DMARC	O
specifications	O
to	O
provide	O
better	O
security	O
for	O
message	O
transmission	O
and	O
Extended	B-Application
Validation	I-Application
Certificate	I-Application
to	O
secure	O
the	O
user	O
's	O
connection	O
with	O
Outlook.com	B-Operating_System
.	O
</s>
<s>
On	O
April	O
17	O
,	O
2013	O
,	O
Microsoft	O
added	O
two	O
step	O
verification	O
to	O
Microsoft	O
accounts	O
,	O
thereby	O
by	O
extension	O
to	O
Outlook.com	B-Operating_System
.	O
</s>
<s>
Outlook.com	B-Operating_System
integrates	O
with	O
Office	O
for	O
the	O
web	O
to	O
allow	O
viewing	O
and	O
editing	O
of	O
Microsoft	B-Application
Word	I-Application
,	O
Excel	B-Application
and	O
PowerPoint	B-Application
documents	O
that	O
are	O
attached	O
to	O
the	O
email	O
messages	O
.	O
</s>
<s>
Users	O
can	O
directly	O
open	O
attached	O
Office	O
documents	O
within	O
the	O
web	B-Application
browser	I-Application
,	O
and	O
save	O
them	O
into	O
their	O
OneDrive	B-Application
.	O
</s>
<s>
In	O
addition	O
,	O
users	O
may	O
also	O
send	O
up	O
to	O
25	O
GB	O
of	O
Office	O
documents	O
(	O
up	O
to	O
50	O
MB	O
each	O
)	O
using	O
Outlook.com	B-Operating_System
by	O
uploading	O
these	O
documents	O
onto	O
OneDrive	B-Application
,	O
and	O
share	O
these	O
documents	O
with	O
other	O
users	O
for	O
viewing	O
or	O
collaboration	O
.	O
</s>
<s>
Users	O
can	O
also	O
save	O
emails	O
to	O
OneNote	B-Application
.	O
</s>
<s>
A	O
preview	O
version	O
of	O
Skype	B-Application
for	O
Outlook.com	B-Operating_System
started	O
rolling	O
out	O
in	O
the	O
UK	O
on	O
April	O
30	O
,	O
2013	O
.	O
</s>
<s>
This	O
feature	O
allows	O
users	O
to	O
make	O
a	O
Skype	B-Application
video	I-Application
call	O
within	O
Outlook.com	B-Operating_System
without	O
using	O
the	O
Skype	B-Application
desktop	O
client	O
.	O
</s>
<s>
For	O
a	O
given	O
account	O
,	O
all	O
aliases	O
use	O
the	O
same	O
inbox	O
,	O
contact	B-Protocol
list	I-Protocol
,	O
and	O
account	O
settings	O
—	O
including	O
password	O
—	O
as	O
the	O
primary	O
address	O
.	O
</s>
<s>
The	O
freeware	O
version	O
of	O
hotmail.com	B-Operating_System
provides	O
a	O
list	O
of	O
almost	O
50	O
keyboard	B-Device
shortcuts	O
for	O
web	O
users	O
with	O
visual	O
impairment	O
,	O
blindness	O
or	O
other	O
disabilities	O
.	O
</s>
<s>
Mail	B-Protocol
is	O
the	O
webmail	B-Protocol
component	O
of	O
Outlook.com	B-Operating_System
.	O
</s>
<s>
Mail	B-Protocol
's	O
Active	O
View	O
allows	O
users	O
to	O
interact	O
directly	O
with	O
contents	O
and	O
functionality	O
within	O
their	O
email	O
message	O
.	O
</s>
<s>
In	O
addition	O
,	O
Mail	B-Protocol
provides	O
a	O
partner	O
platform	O
which	O
allows	O
contents	O
and	O
functionality	O
from	O
various	O
websites	O
and	O
services	O
such	O
as	O
YouTube	B-General_Concept
,	O
Flickr	B-Algorithm
,	O
LinkedIn	B-Application
,	O
and	O
the	O
United	O
States	O
Postal	O
Service	O
to	O
be	O
viewed	O
directly	O
within	O
the	O
email	O
message	O
.	O
</s>
<s>
For	O
example	O
,	O
users	O
may	O
view	O
the	O
YouTube	B-General_Concept
video	I-General_Concept
within	O
Mail	B-Protocol
when	O
a	O
user	O
receives	O
an	O
email	O
which	O
contains	O
a	O
link	O
to	O
the	O
video	O
.	O
</s>
<s>
Other	O
Active	O
View	O
features	O
include	O
tracking	O
of	O
real	O
time	O
shipping	O
status	O
from	O
United	O
States	O
Postal	O
Service	O
and	O
performing	O
social	O
networking	O
actions	O
on	O
LinkedIn	B-Application
or	O
other	O
social	O
networking	O
sites	O
directly	O
from	O
within	O
the	O
email	O
message	O
.	O
</s>
<s>
Mail	B-Protocol
offers	O
a	O
"	O
virtual	O
broom	O
"	O
which	O
allow	O
users	O
to	O
delete	O
or	O
move	O
large	O
numbers	O
of	O
emails	O
into	O
specified	O
folders	O
based	O
on	O
the	O
sender	O
's	O
information	O
.	O
</s>
<s>
Once	O
a	O
"	O
sweep	O
"	O
is	O
performed	O
,	O
the	O
user	O
may	O
choose	O
to	O
configure	O
Mail	B-Protocol
to	O
remember	O
the	O
sweep	O
settings	O
and	O
perform	O
the	O
same	O
move	O
or	O
delete	O
actions	O
for	O
any	O
future	O
emails	O
.	O
</s>
<s>
One-click	O
filters	O
allow	O
users	O
to	O
filter	O
the	O
inbox	O
(	O
or	O
specific	O
folder	O
)	O
based	O
on	O
whether	O
or	O
not	O
the	O
email	O
message	O
is	O
unread	O
,	O
from	O
the	O
People	O
service	O
list	O
,	O
group	O
mailing	O
lists	O
,	O
or	O
from	O
a	O
social	O
networking	O
website	O
( à	O
la	O
LinkedIn	B-Application
)	O
.	O
</s>
<s>
Outlook	O
's	O
time-management	O
web	B-Application
application	I-Application
was	O
first	O
released	O
on	O
January	O
14	O
,	O
2008	O
,	O
as	O
Windows	O
Live	O
Calendar	B-Protocol
,	O
and	O
was	O
updated	O
to	O
the	O
"	O
Wave	O
4	O
"	O
release	O
on	O
June	O
7	O
,	O
2010	O
.	O
</s>
<s>
Calendar	B-Protocol
features	O
a	O
similar	O
interface	O
to	O
desktop	O
calendar	B-Application
applications	I-Application
such	O
as	O
Windows	B-Protocol
Calendar	I-Protocol
,	O
and	O
supports	O
iCalendar	O
files	O
for	O
users	O
to	O
import	O
calendar	B-Protocol
entries	O
into	O
their	O
calendars	B-Protocol
.	O
</s>
<s>
It	O
uses	O
Ajax	B-General_Concept
technology	O
which	O
enables	O
users	O
to	O
view	O
,	O
add	O
and	O
drag-and-drop	O
calendar	B-Protocol
events	O
from	O
one	O
date	O
to	O
another	O
without	O
reloading	O
the	O
page	O
,	O
and	O
features	O
daily	O
,	O
weekly	O
,	O
monthly	O
and	O
agenda	O
view	O
modes	O
.	O
</s>
<s>
Calendar	B-Protocol
events	O
are	O
stored	O
online	O
and	O
can	O
be	O
viewed	O
from	O
any	O
location	O
.	O
</s>
<s>
Multiple	O
calendars	B-Protocol
can	O
be	O
created	O
and	O
shared	O
,	O
allowing	O
different	O
levels	O
of	O
permissions	O
for	O
each	O
user	O
.	O
</s>
<s>
Outlook	O
's	O
contacts	B-Operating_System
management	O
service	O
was	O
originally	O
known	O
as	O
Windows	O
Live	O
Contacts	B-Operating_System
and	O
before	O
that	O
,	O
Windows	O
Live	O
People	O
.	O
</s>
<s>
It	O
provides	O
users	O
with	O
access	O
to	O
their	O
contacts	B-Operating_System
 '	O
profiles	O
and	O
information	O
,	O
allowing	O
them	O
to	O
share	O
different	O
information	O
with	O
different	O
groups	O
of	O
people	O
.	O
</s>
<s>
Besides	O
an	O
address	B-Operating_System
book	I-Operating_System
,	O
People	O
also	O
provides	O
integrated	O
services	O
with	O
social	O
media	O
,	O
such	O
as	O
Facebook	B-Application
and	O
Twitter	B-Application
.	O
</s>
<s>
The	O
service	O
was	O
rebranded	O
to	O
its	O
current	O
name	O
in	O
2012	O
,	O
introducing	O
a	O
new	O
interface	O
based	O
on	O
the	O
Metro	O
design	O
language	O
that	O
had	O
already	O
been	O
introduced	O
with	O
Outlook.com	B-Operating_System
.	O
</s>
<s>
Contacts	B-Operating_System
are	O
automatically	O
updated	O
in	O
real-time	O
,	O
and	O
the	O
service	O
allows	O
for	O
the	O
removal	O
of	O
duplicated	O
contact	O
entries	O
when	O
imported	O
with	O
Profile	O
.	O
</s>
<s>
To	O
Do	O
is	O
task	O
management	O
component	O
of	O
Outlook.com	B-Operating_System
introduced	O
during	O
the	O
transition	O
to	O
the	O
Office	O
365-based	O
infrastructure	O
.	O
</s>
<s>
Outlook.com	B-Operating_System
supports	O
email	B-Protocol
clients	I-Protocol
connecting	O
through	O
the	O
following	O
protocols	O
,	O
listed	O
in	O
chronological	O
order	O
:	O
</s>
<s>
WebDAV	B-Protocol
was	O
used	O
by	O
Outlook	B-Application
Express	I-Application
but	O
was	O
discontinued	O
on	O
September	O
1	O
,	O
2009	O
.	O
</s>
<s>
Microsoft	B-Application
Outlook	I-Application
2002	I-Application
,	O
introduced	O
in	O
Microsoft	B-Operating_System
Office	I-Operating_System
XP	I-Operating_System
,	O
included	O
integrated	O
support	O
for	O
Outlook.com	B-Operating_System
accounts	O
.	O
</s>
<s>
DeltaSync	B-Device
was	O
used	O
by	O
Microsoft	B-Application
Outlook	I-Application
Hotmail	B-Operating_System
Connector	O
,	O
a	O
free	O
plug-in	O
for	O
Microsoft	B-Application
Outlook	I-Application
2003	O
,	O
2007	O
or	O
2010	O
.	O
</s>
<s>
Using	O
the	O
Outlook	O
connector	O
,	O
users	O
can	O
freely	O
access	O
email	O
messages	O
,	O
contacts	B-Operating_System
,	O
and	O
calendars	B-Protocol
in	O
any	O
Outlook.com	B-Operating_System
account	O
,	O
though	O
access	O
to	O
tasks	O
and	O
notes	O
requires	O
a	O
premium	O
subscription	O
.	O
</s>
<s>
Another	O
alternative	O
for	O
users	O
is	O
to	O
use	O
the	O
Windows	B-Application
Live	I-Application
Mail	I-Application
desktop	I-Application
client	O
,	O
which	O
had	O
built-in	O
support	O
for	O
Hotmail	B-Operating_System
.	O
</s>
<s>
Post	B-Protocol
Office	I-Protocol
Protocol	I-Protocol
version	O
3	O
(	O
POP3	B-Protocol
)	O
access	O
was	O
made	O
available	O
for	O
all	O
Hotmail	B-Operating_System
accounts	O
as	O
part	O
of	O
the	O
"	O
Wave	O
3	O
"	O
release	O
,	O
adding	O
support	O
to	O
access	O
Hotmail	B-Operating_System
from	O
any	O
email	B-Protocol
client	I-Protocol
that	O
supported	O
this	O
protocol	O
.	O
</s>
<s>
Exchange	B-Protocol
ActiveSync	I-Protocol
(	O
EAS	O
)	O
support	O
was	O
added	O
as	O
part	O
of	O
the	O
Hotmail	B-Operating_System
"	O
Wave	O
4	O
"	O
release	O
,	O
allowing	O
users	O
to	O
synchronise	O
not	O
just	O
their	O
email	O
,	O
but	O
also	O
their	O
contacts	B-Operating_System
and	O
calendar	B-Protocol
on	O
any	O
device	O
that	O
supports	O
EAS	O
.	O
</s>
<s>
On	O
September	O
12	O
,	O
2013	O
,	O
Microsoft	O
added	O
support	O
for	O
Internet	B-Protocol
Message	I-Protocol
Access	I-Protocol
Protocol	I-Protocol
(	O
IMAP	B-Protocol
)	O
and	O
OAuth	O
.	O
</s>
<s>
Like	O
many	O
free	O
webmail	B-Protocol
services	O
,	O
Hotmail	B-Operating_System
was	O
often	O
used	O
by	O
spammers	O
for	O
illicit	O
purposes	O
such	O
as	O
junk	O
or	O
chain	O
mailing	O
and	O
unwanted	O
marketing	O
,	O
due	O
to	O
wide	O
availability	O
,	O
service	O
popularity	O
,	O
and	O
ease	O
of	O
registration	O
of	O
new	O
accounts	O
.	O
</s>
<s>
Hotmail	B-Operating_System
amended	O
its	O
service	O
agreement	O
stating	O
that	O
any	O
account	O
engaging	O
in	O
these	O
activities	O
would	O
be	O
terminated	O
without	O
warning	O
.	O
</s>
<s>
The	O
ability	O
to	O
associate	O
Outlook.com	B-Operating_System
accounts	O
with	O
mobile	O
phones	O
or	O
other	O
email	O
addresses	O
was	O
initially	O
advertised	O
as	O
an	O
optional	O
feature	O
.	O
</s>
<s>
However	O
,	O
an	O
update	O
in	O
2013	O
required	O
many	O
users	O
to	O
associate	O
their	O
accounts	O
before	O
the	O
website	O
would	O
allow	O
them	O
to	O
log	O
in	O
–	O
a	O
refusal	O
which	O
could	O
be	O
sidestepped	O
by	O
using	O
an	O
app	O
,	O
such	O
as	O
Windows	B-Application
Live	I-Application
Mail	I-Application
2011	O
or	O
2012	O
,	O
to	O
access	O
the	O
account	O
instead	O
of	O
a	O
web	B-Application
browser	I-Application
(	O
and	O
it	O
remains	O
possible	O
to	O
"	O
associate	O
"	O
an	O
account	O
with	O
a	O
one-use	O
,	O
or	O
otherwise	O
'	O
disposable	O
 '	O
,	O
e-mail	O
address	O
)	O
.	O
</s>
<s>
According	O
to	O
theguardian.com,	O
several	O
top-secret	O
internal	O
National	O
Security	O
Agency	O
(	O
NSA	O
)	O
newsletters	O
indicate	O
that	O
Microsoft	O
has	O
allowed	O
NSA	O
to	O
access	O
chats	O
and	O
emails	O
on	O
Outlook.com,	O
and	O
implemented	O
a	O
bypass	O
of	O
its	O
advertised	O
encryption	O
in	O
order	O
to	O
facilitate	O
government	O
access	O
.	O
</s>
<s>
One	O
newsletter	O
entry	O
dated	O
December	O
26	O
,	O
2012	O
,	O
shows	O
that	O
Microsoft	O
had	O
"	O
developed	O
a	O
surveillance	O
capability	O
to	O
deal	O
"	O
with	O
the	O
interception	O
of	O
encrypted	O
chats	O
on	O
Outlook.com,	O
within	O
five	O
months	O
after	O
the	O
service	O
went	O
into	O
public	O
testing	O
.	O
</s>
<s>
Another	O
entry	O
states	O
that	O
"	O
for	O
Prism	O
collection	O
against	O
Hotmail	B-Operating_System
,	O
Live	O
,	O
and	O
Outlook.com	B-Operating_System
emails	O
will	O
be	O
unaffected	O
because	O
Prism	O
collects	O
this	O
data	O
prior	O
to	O
encryption	O
"	O
.	O
</s>
