<s>
Microsoft	B-Application
Outlook	I-Application
is	O
a	O
personal	B-Application
information	I-Application
manager	I-Application
software	O
system	O
from	O
Microsoft	O
,	O
available	O
as	O
a	O
part	O
of	O
the	O
Microsoft	B-Application
Office	I-Application
and	O
Microsoft	B-Operating_System
365	I-Operating_System
software	O
suites	O
.	O
</s>
<s>
Though	O
primarily	O
an	O
email	B-Protocol
client	I-Protocol
,	O
Outlook	O
also	O
includes	O
such	O
functions	O
as	O
calendaring	B-Application
,	O
task	O
managing	O
,	O
contact	B-Application
managing	I-Application
,	O
note-taking	O
,	O
journal	B-General_Concept
logging	I-General_Concept
and	O
web	O
browsing	O
,	O
and	O
has	O
also	O
become	O
a	O
popular	O
email	B-Protocol
client	I-Protocol
for	O
many	O
businesses	O
.	O
</s>
<s>
Individuals	O
can	O
use	O
Outlook	O
as	O
a	O
stand-alone	O
application	O
;	O
organizations	O
can	O
deploy	O
it	O
as	O
multi-user	B-Operating_System
software	I-Operating_System
(	O
through	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
Server	I-Operating_System
or	O
SharePoint	B-Protocol
)	O
for	O
such	O
shared	O
functions	O
as	O
mailboxes	O
,	O
calendars	B-Operating_System
,	O
folders	B-General_Concept
,	O
data	O
aggregation	O
(	O
i.e.	O
,	O
SharePoint	B-Protocol
lists	O
)	O
,	O
and	O
appointment	B-Application
scheduling	I-Application
.	O
</s>
<s>
Apps	B-Application
of	O
Outlook	O
for	O
mobile	B-Operating_System
platforms	I-Operating_System
are	O
also	O
offered	O
.	O
</s>
<s>
Outlook.com	B-Operating_System
is	O
a	O
free	O
webmail	B-Protocol
version	O
of	O
Microsoft	B-Application
Outlook	I-Application
,	O
using	O
a	O
similar	O
user	B-Application
interface	I-Application
.	O
</s>
<s>
Originally	O
known	O
as	O
Hotmail	B-Operating_System
,	O
it	O
was	O
rebranded	O
as	O
Outlook.com	B-Operating_System
in	O
2012	O
.	O
</s>
<s>
Outlook	B-Protocol
on	I-Protocol
the	I-Protocol
web	I-Protocol
(	O
previously	O
called	O
Exchange	B-Operating_System
Web	O
Connect	O
,	O
Outlook	B-Protocol
Web	I-Protocol
Access	I-Protocol
,	O
and	O
Outlook	B-Protocol
Web	I-Protocol
App	I-Protocol
)	O
is	O
a	O
web	O
business	O
version	O
of	O
Microsoft	B-Application
Outlook	I-Application
,	O
and	O
is	O
included	O
in	O
Office	B-Operating_System
365	I-Operating_System
,	O
Exchange	B-Operating_System
Server	I-Operating_System
,	O
and	O
Exchange	B-Operating_System
Online	O
.	O
</s>
<s>
Outlook	O
has	O
replaced	O
Microsoft	O
's	O
previous	O
scheduling	B-Application
and	O
email	B-Protocol
clients	I-Protocol
,	O
Schedule+	B-Application
and	O
Exchange	B-Operating_System
Client	I-Operating_System
.	O
</s>
<s>
Outlook	O
98	O
and	O
Outlook	B-Application
2000	I-Application
offer	O
two	O
configurations	O
:	O
</s>
<s>
Internet	O
Mail	O
Only	O
(	O
aka	O
IMO	O
mode	O
)	O
:	O
A	O
lighter	O
application	O
mode	O
with	O
specific	O
emphasis	O
on	O
POP3	B-Protocol
and	O
IMAP	B-Protocol
accounts	O
,	O
including	O
a	O
lightweight	O
Fax	O
application	O
.	O
</s>
<s>
Corporate	O
Work	O
group	O
(	O
aka	O
CW	O
mode	O
)	O
:	O
A	O
full	O
MAPI	B-Protocol
client	O
with	O
specific	O
emphasis	O
on	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
accounts	O
.	O
</s>
<s>
Perpetual	B-License
versions	O
of	O
Microsoft	B-Application
Outlook	I-Application
include	O
:	O
</s>
<s>
Release	O
date	O
Notes	O
Outlook	O
97	O
8.0	O
January	O
16	O
,	O
1997	O
Included	O
in	O
Office	B-Operating_System
97	I-Operating_System
and	O
bundled	O
with	O
Exchange	B-Operating_System
Server	I-Operating_System
5.0	O
and	O
5.5	O
Outlook	O
98	O
8.5	O
June	O
21	O
,	O
1998	O
Freely	O
distributed	O
with	O
books	O
and	O
magazines	O
for	O
coping	O
with	O
the	O
newest	O
Internet	O
standard	O
such	O
as	O
HTML	B-Language
email	O
.	O
</s>
<s>
Outlook	O
98	O
setup	O
was	O
based	O
on	O
Active	O
Setup	O
which	O
also	O
installed	O
Internet	B-Protocol
Explorer	I-Protocol
4	I-Protocol
.	O
</s>
<s>
Outlook	B-Application
2000	I-Application
9.0	O
June	O
27	O
,	O
1999	O
Included	O
in	O
Office	B-Operating_System
2000	I-Operating_System
and	O
bundled	O
with	O
Exchange	B-Operating_System
2000	O
Server	O
.	O
</s>
<s>
Outlook	B-Application
2002	I-Application
10	O
May	O
31	O
,	O
2001	O
Included	O
in	O
Office	B-Operating_System
XP	I-Operating_System
Outlook	B-Application
2003	I-Application
11	O
November	O
20	O
,	O
2003	O
Included	O
in	O
Office	B-General_Concept
2003	I-General_Concept
(	O
incl	O
.	O
</s>
<s>
Microsoft	B-Application
Outlook	I-Application
is	O
a	O
part	O
of	O
Office	O
Suite	O
that	O
can	O
be	O
used	O
as	O
a	O
standalone	O
application	O
.	O
</s>
<s>
It	O
helps	O
you	O
to	O
access	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
Server	I-Operating_System
email	O
.	O
</s>
<s>
Additionally	O
,	O
it	O
provides	O
contacts	O
,	O
calendaring	B-Application
,	O
and	O
task	O
management	O
functionality	O
.	O
</s>
<s>
Many	O
organizations	O
integrate	O
Outlook	O
with	O
the	O
Microsoft	B-Protocol
Sharepoint	I-Protocol
platform	O
for	O
sharing	O
crucial	O
file	O
data	O
.	O
</s>
<s>
Outlook	B-Application
2002	I-Application
introduced	O
these	O
new	O
features	O
:	O
</s>
<s>
SP2	O
allows	O
users	O
to	O
—	O
through	O
the	O
Registry	B-Protocol
—	O
prevent	O
the	O
addition	O
of	O
new	O
email	O
accounts	O
or	O
the	O
creation	O
of	O
new	O
Personal	B-Operating_System
Storage	I-Operating_System
Tables	I-Operating_System
;	O
</s>
<s>
Smart	B-Application
tags	I-Application
when	O
Word	B-Application
is	O
configured	O
as	O
the	O
default	O
email	O
editor	O
.	O
</s>
<s>
This	O
option	O
was	O
available	O
only	O
when	O
the	O
versions	O
of	O
Outlook	O
and	O
Word	B-Application
were	O
the	O
same	O
,	O
i.e.	O
</s>
<s>
Outlook	B-Application
2003	I-Application
introduced	O
these	O
new	O
features	O
:	O
</s>
<s>
Images	O
in	O
HTML	B-Language
mail	O
are	O
blocked	O
by	O
default	O
to	O
prevent	O
spammers	O
from	O
determining	O
whether	O
an	O
email	O
address	O
is	O
active	O
via	O
web	B-Protocol
beacon	I-Protocol
;	O
</s>
<s>
SP1	O
introduced	O
the	O
ability	O
to	O
block	O
email	O
based	O
on	O
country	B-Application
code	I-Application
top-level	I-Application
domains	I-Application
;	O
</s>
<s>
Features	O
that	O
debuted	O
in	O
Outlook	B-Application
2007	I-Application
include	O
:	O
</s>
<s>
Supported	O
file	O
types	O
include	O
Excel	B-Application
,	O
PowerPoint	B-Application
,	O
Visio	B-Application
,	O
and	O
Word	B-Application
files	I-Application
.	O
</s>
<s>
If	O
Outlook	B-Application
2007	I-Application
is	O
installed	O
on	O
Windows	B-Application
Vista	I-Application
,	O
then	O
audio	O
and	O
video	O
files	O
can	O
be	O
previewed	O
.	O
</s>
<s>
If	O
a	O
compatible	O
PDF	B-Language
reader	I-Language
such	O
as	O
Adobe	B-Application
Acrobat	I-Application
8.1	O
is	O
installed	O
,	O
PDF	B-Application
files	I-Application
can	O
also	O
be	O
previewed	O
.	O
</s>
<s>
To-Do	B-Application
Bar	O
that	O
consolidates	O
calendar	B-Operating_System
information	O
,	O
flagged	O
email	O
,	O
and	O
tasks	O
from	O
OneNote	B-Application
2007	O
,	O
Outlook	B-Application
2007	I-Application
,	O
Project	B-Operating_System
2007	O
,	O
and	O
Windows	O
SharePoint	O
Services	O
3.0	O
websites	O
within	O
a	O
central	O
location	O
.	O
</s>
<s>
Word	B-Application
2007	I-Application
replaces	O
Internet	B-Application
Explorer	I-Application
as	O
the	O
default	O
viewer	O
for	O
HTML	B-Language
email	O
,	O
and	O
becomes	O
the	O
default	O
email	O
editor	O
in	O
this	O
and	O
all	O
subsequent	O
versions	O
.	O
</s>
<s>
Features	O
that	O
debuted	O
in	O
Outlook	B-Operating_System
2010	I-Operating_System
include	O
:	O
</s>
<s>
Features	O
that	O
debuted	O
in	O
Outlook	B-Operating_System
2013	I-Operating_System
,	O
which	O
was	O
released	O
on	O
January	O
29	O
,	O
2013	O
,	O
include	O
:	O
</s>
<s>
Microsoft	O
also	O
released	O
several	O
versions	O
of	O
Outlook	O
for	O
classic	B-Application
Mac	I-Application
OS	I-Application
,	O
though	O
it	O
was	O
only	O
for	O
use	O
with	O
Exchange	B-Operating_System
servers	I-Operating_System
.	O
</s>
<s>
It	O
was	O
not	O
provided	O
as	O
a	O
component	O
of	O
Microsoft	B-Application
Office	I-Application
for	I-Application
Mac	I-Application
but	O
instead	O
made	O
available	O
to	O
users	O
from	O
administrators	O
or	O
by	O
download	O
.	O
</s>
<s>
The	O
final	O
version	O
was	O
Outlook	O
for	O
Mac	O
2001	O
,	O
which	O
was	O
fairly	O
similar	O
to	O
Outlook	B-Application
2000	I-Application
and	O
2002	O
apart	O
from	O
being	O
exclusively	O
for	O
Exchange	B-Operating_System
users	O
.	O
</s>
<s>
Microsoft	B-Application
Entourage	I-Application
was	O
introduced	O
as	O
an	O
Outlook-like	O
application	O
for	O
Mac	B-Application
OS	I-Application
in	O
Office	O
2001	O
,	O
but	O
it	O
lacked	O
Exchange	B-Operating_System
connectivity	O
.	O
</s>
<s>
Partial	O
support	O
for	O
Exchange	B-Operating_System
server	I-Operating_System
became	O
available	O
natively	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
with	O
Entourage	O
2004	O
Service	O
Pack	O
2	O
.	O
</s>
<s>
Entourage	O
is	O
not	O
directly	O
equivalent	O
to	O
Outlook	O
in	O
terms	O
of	O
design	O
or	O
operation	O
;	O
rather	O
,	O
it	O
is	O
a	O
distinct	O
application	O
that	O
has	O
several	O
overlapping	O
features	O
including	O
Exchange	B-Operating_System
client	I-Operating_System
capabilities	O
.	O
</s>
<s>
Somewhat	O
improved	O
Exchange	B-Operating_System
support	O
was	O
added	O
in	O
Entourage	B-Application
2008	I-Application
Web	O
Services	O
Edition	O
.	O
</s>
<s>
It	O
is	O
the	O
first	O
native	O
version	O
of	O
Outlook	O
for	O
MacOS	B-Application
.	O
</s>
<s>
Outlook	B-Application
2011	I-Application
initially	O
supported	O
Mac	B-Application
OS	I-Application
X	I-Application
's	O
Sync	O
Services	O
only	O
for	O
contacts	O
,	O
not	O
events	O
,	O
tasks	O
or	O
notes	O
.	O
</s>
<s>
It	O
also	O
does	O
not	O
have	O
a	O
Project	B-Operating_System
Manager	O
equivalent	O
to	O
that	O
in	O
Entourage	O
.	O
</s>
<s>
With	O
Service	O
Pack	O
1	O
(	O
v	O
14.1.0	O
)	O
,	O
published	O
on	O
April	O
12	O
,	O
2011	O
,	O
Outlook	O
can	O
now	O
sync	O
calendar	B-Operating_System
,	O
notes	O
and	O
tasks	O
with	O
Exchange	B-Operating_System
2007	O
and	O
Exchange	B-Operating_System
2010	O
.	O
</s>
<s>
On	O
October	O
31	O
,	O
2014	O
,	O
Microsoft	O
released	O
Outlook	O
for	O
Mac	O
(	O
v15.3	O
build	O
141024	O
)	O
with	O
Office	B-Operating_System
365	I-Operating_System
(	O
a	O
software	B-Architecture
as	I-Architecture
a	I-Architecture
service	I-Architecture
licensing	O
program	O
that	O
makes	O
Office	O
programs	O
available	O
as	O
soon	O
as	O
they	O
are	O
developed	O
)	O
.	O
</s>
<s>
A	O
new	O
modern	O
user	B-Application
interface	I-Application
with	O
improved	O
scrolling	O
and	O
agility	O
when	O
switching	O
between	O
Ribbon	O
tabs	O
.	O
</s>
<s>
Online	O
archive	O
support	O
for	O
searching	O
Exchange	B-Operating_System
(	O
online	O
or	O
on-premises	O
)	O
archived	O
mail	O
.	O
</s>
<s>
Master	O
Category	O
List	O
support	O
and	O
enhancements	O
delivering	O
access	O
to	O
category	O
lists	O
(	O
name	O
and	O
color	O
)	O
and	O
sync	O
between	O
Mac	O
,	O
Microsoft	B-Application
Windows	I-Application
and	O
OWA	O
clients	O
.	O
</s>
<s>
Office	B-Operating_System
365	I-Operating_System
push	O
email	O
support	O
for	O
real-time	O
email	O
delivery	O
.	O
</s>
<s>
Faster	O
first-run	O
and	O
email	O
download	O
experience	O
with	O
improved	O
Exchange	B-Operating_System
Web	O
Services	O
syncing	O
.	O
</s>
<s>
It	O
requires	O
macOS	B-Application
10.14	O
or	O
greater	O
and	O
introduces	O
a	O
redesigned	O
interface	O
with	O
significantly	O
changed	O
internals	O
,	O
including	O
native	O
search	O
within	O
the	O
client	O
that	O
no	O
longer	O
depends	O
on	O
macOS	B-Application
Spotlight	B-Application
.	O
</s>
<s>
To	O
date	O
,	O
the	O
Macintosh	O
client	O
has	O
never	O
had	O
the	O
capability	O
of	O
syncing	O
Contact	O
Groups/Personal	O
Distribution	B-General_Concept
Lists	I-General_Concept
from	O
Exchange	B-Operating_System
,	O
Microsoft	B-Operating_System
365	I-Operating_System
or	O
Outlook.com	B-Operating_System
accounts	O
,	O
something	O
that	O
the	O
Windows	O
and	O
web	O
clients	O
have	O
always	O
supported	O
.	O
</s>
<s>
A	O
UserVoice	O
post	O
created	O
in	O
December	O
2019	O
suggesting	O
that	O
the	O
missing	O
functionality	O
be	O
added	O
has	O
shown	O
a	O
"	O
Planned	O
"	O
tag	B-Protocol
since	O
October	O
2020	O
.	O
</s>
<s>
This	O
means	O
that	O
users	O
will	O
no	O
longer	O
need	O
a	O
Microsoft	B-Operating_System
365	I-Operating_System
subscription	O
or	O
an	O
Office	O
licence	O
to	O
use	O
the	O
program	O
.	O
</s>
<s>
First	O
released	O
in	O
April	O
2014	O
by	O
the	O
venture	O
capital-backed	O
startup	O
Acompli	B-Protocol
,	O
the	O
company	O
was	O
acquired	O
by	O
Microsoft	O
in	O
December	O
2014	O
.	O
</s>
<s>
On	O
January	O
29	O
,	O
2015	O
,	O
Acompli	B-Protocol
was	O
re-branded	O
as	O
Outlook	B-Application
Mobile	I-Application
—	O
sharing	O
its	O
name	O
with	O
the	O
Microsoft	B-Application
Outlook	I-Application
desktop	O
personal	B-Application
information	I-Application
manager	I-Application
and	O
Outlook.com	B-Operating_System
email	O
service	O
.	O
</s>
<s>
In	O
January	O
2015	O
,	O
Microsoft	O
released	O
Outlook	O
for	O
phones	O
and	O
for	O
tablets	B-Device
(	O
v1.3	O
build	O
)	O
with	O
Office	B-Operating_System
365	I-Operating_System
.	O
</s>
<s>
This	O
was	O
the	O
first	O
Outlook	O
for	O
these	O
platforms	O
with	O
email	O
,	O
calendar	B-Operating_System
,	O
and	O
contacts	O
.	O
</s>
<s>
On	O
February	O
4	O
,	O
2015	O
,	O
Microsoft	O
acquired	O
Sunrise	B-Application
Calendar	I-Application
;	O
on	O
September	O
13	O
,	O
2016	O
,	O
Sunrise	B-Application
ceased	O
to	O
operate	O
,	O
and	O
an	O
update	O
was	O
released	O
to	O
Outlook	B-Application
Mobile	I-Application
that	O
contained	O
enhancements	O
to	O
its	O
calendar	B-Operating_System
functions	O
.	O
</s>
<s>
Similar	O
to	O
its	O
desktop	O
counterpart	O
,	O
Outlook	B-Application
mobile	I-Application
offers	O
an	O
aggregation	O
of	O
attachments	O
and	O
files	O
stored	O
on	O
cloud	O
storage	O
platforms	O
;	O
a	O
"	O
focused	O
inbox	O
"	O
highlights	O
messages	O
from	O
frequent	O
contacts	O
,	O
and	O
calendar	B-Operating_System
events	O
,	O
files	O
,	O
and	O
locations	O
can	O
be	O
embedded	O
in	O
messages	O
without	O
switching	O
apps	B-Application
.	O
</s>
<s>
The	O
app	O
supports	O
a	O
number	O
of	O
email	O
platforms	O
and	O
services	O
,	O
including	O
Outlook.com,	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
and	O
Google	B-Application
Workspace	I-Application
(	O
formerly	O
G	B-Application
Suite	I-Application
)	O
among	O
others	O
.	O
</s>
<s>
Outlook	B-Application
mobile	I-Application
is	O
designed	O
to	O
consolidate	O
functionality	O
that	O
would	O
normally	O
be	O
found	O
in	O
separate	O
apps	B-Application
on	O
mobile	O
devices	O
,	O
similarly	O
to	O
personal	B-Application
information	I-Application
managers	I-Application
on	O
personal	B-Device
computers	I-Device
.	O
</s>
<s>
is	O
designed	O
around	O
four	O
"	O
hubs	O
"	O
for	O
different	O
tasks	O
,	O
including	O
"	O
Mail	O
"	O
,	O
"	O
Calendar	B-Operating_System
,	O
"	O
"	O
Files	O
"	O
and	O
"	O
People	O
"	O
.	O
</s>
<s>
The	O
"	O
People	O
"	O
hub	O
lists	O
frequently	O
and	O
recently	O
used	O
contacts	O
and	O
aggregates	O
recent	O
communications	O
with	O
them	O
,	O
and	O
the	O
"	O
Files	O
"	O
hub	O
aggregates	O
recent	O
attachments	O
from	O
messages	O
,	O
and	O
can	O
also	O
integrate	O
with	O
other	O
online	O
storage	O
services	O
such	O
as	O
Dropbox	B-Application
,	O
Google	B-Application
Drive	I-Application
,	O
and	O
OneDrive	B-Application
.	O
</s>
<s>
Outlook	B-Application
mobile	I-Application
supports	O
a	O
large	O
number	O
of	O
different	O
e-mail	O
services	O
and	O
platforms	O
,	O
including	O
Exchange	B-Operating_System
,	O
iCloud	B-Application
,	O
GMail	B-Application
,	O
Google	B-Application
Workspace	I-Application
(	O
formerly	O
G	B-Application
Suite	I-Application
)	O
,	O
Outlook.com,	O
and	O
Yahoo	O
!	O
</s>
<s>
Files	O
,	O
locations	O
,	O
and	O
calendar	B-Operating_System
events	O
can	O
be	O
embedded	O
into	O
email	O
messages	O
.	O
</s>
<s>
Like	O
the	O
desktop	O
Outlook	O
,	O
Outlook	B-Application
mobile	I-Application
allows	O
users	O
to	O
see	O
appointment	O
details	O
,	O
respond	O
to	O
Exchange	B-Operating_System
meeting	O
invites	O
,	O
and	O
schedule	O
meetings	O
.	O
</s>
<s>
It	O
also	O
incorporates	O
the	O
three-day	O
view	O
and	O
"	O
Interesting	O
Calendars	B-Operating_System
"	O
features	O
from	O
Sunrise	B-Application
.	O
</s>
<s>
Outlook	B-Application
mobile	I-Application
temporarily	O
stores	O
and	O
indexes	O
user	O
data	O
(	O
including	O
email	O
,	O
attachments	O
,	O
calendar	B-Operating_System
information	O
,	O
and	O
contacts	O
)	O
,	O
along	O
with	O
login	O
credentials	O
,	O
in	O
a	O
"	O
secure	O
"	O
form	O
on	O
Microsoft	B-Application
Azure	I-Application
servers	O
located	O
in	O
the	O
United	O
States	O
.	O
</s>
<s>
On	O
Exchange	B-Operating_System
accounts	O
,	O
these	O
servers	O
identify	O
as	O
a	O
single	O
Exchange	B-Protocol
ActiveSync	I-Protocol
user	O
in	O
order	O
to	O
fetch	O
e-mail	O
.	O
</s>
<s>
Additionally	O
,	O
the	O
app	O
does	O
not	O
support	O
mobile	O
device	O
management	O
,	O
nor	O
allows	O
administrators	O
to	O
control	O
how	O
third-party	O
cloud	B-Application
storage	I-Application
services	I-Application
are	O
used	O
with	O
the	O
app	O
to	O
interact	O
with	O
their	O
users	O
.	O
</s>
<s>
Concerns	O
surrounding	O
these	O
security	O
issues	O
have	O
prompted	O
some	O
firms	O
,	O
including	O
the	O
European	O
Parliament	O
,	O
to	O
block	O
the	O
app	O
on	O
their	O
Exchange	B-Operating_System
servers	I-Operating_System
.	O
</s>
<s>
Microsoft	O
maintains	O
a	O
separate	O
,	O
pre-existing	O
Outlook	B-Protocol
Web	I-Protocol
Access	I-Protocol
app	O
for	O
Android	B-Application
and	O
iOS	B-Application
.	O
</s>
<s>
Outlook	O
Groups	O
was	O
a	O
mobile	B-Application
application	I-Application
for	O
Windows	B-Protocol
Phone	I-Protocol
,	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
,	O
Android	B-Application
and	O
iOS	B-Application
that	O
could	O
be	O
used	O
with	O
an	O
Office	B-Operating_System
365	I-Operating_System
domain	O
Microsoft	O
Account	O
,	O
e.g.	O
</s>
<s>
The	O
app	O
lets	O
users	O
create	O
groups	O
,	O
mention	O
their	O
contacts	O
,	O
share	O
Office	O
documents	O
via	O
OneDrive	B-Application
and	O
work	O
on	O
them	O
together	O
,	O
and	O
participate	O
in	O
an	O
email	O
conversation	O
.	O
</s>
<s>
It	O
was	O
tested	O
internally	O
at	O
Microsoft	O
and	O
launched	O
September	O
18	O
,	O
2015	O
for	O
Windows	B-Protocol
Phone	I-Protocol
8.1	O
and	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
users	O
.	O
</s>
<s>
After	O
its	O
initial	O
launch	O
on	O
Microsoft	O
's	O
own	O
platforms	O
they	O
launched	O
the	O
application	O
for	O
Android	B-Application
and	O
iOS	B-Application
on	O
September	O
23	O
,	O
2015	O
.	O
</s>
<s>
The	O
functionality	O
was	O
replaced	O
by	O
adding	O
the	O
"	O
Groups	O
node	O
"	O
to	O
the	O
folder	O
list	O
within	O
the	O
Outlook	B-Application
mobile	I-Application
app	O
.	O
</s>
<s>
Outlook	B-Application
2007	I-Application
was	O
the	O
first	O
Outlook	O
to	O
switch	O
from	O
Internet	B-Application
Explorer	I-Application
rendering	O
engine	O
to	O
Microsoft	B-Application
Word	I-Application
2007	O
's	O
.	O
</s>
<s>
This	O
meant	O
that	O
HTML	B-Language
and	O
Cascading	B-Language
Style	I-Language
Sheets	I-Language
(	O
CSS	B-Language
)	O
items	O
not	O
handled	O
by	O
Word	B-Application
were	O
no	O
longer	O
supported	O
.	O
</s>
<s>
On	O
the	O
other	O
hand	O
,	O
HTML	B-Language
messages	O
composed	O
in	O
Word	B-Application
look	O
as	O
they	O
appeared	O
to	O
the	O
author	O
.	O
</s>
<s>
This	O
affects	O
publishing	O
newsletters	O
and	O
reports	O
,	O
because	O
they	O
frequently	O
use	O
intricate	O
HTML	B-Language
and	O
CSS	B-Language
to	O
form	O
their	O
layout	O
.	O
</s>
<s>
Outlook	O
for	O
Windows	O
has	O
very	O
limited	O
CSS	B-Language
support	O
compared	O
to	O
various	O
other	O
e-mail	B-Protocol
clients	I-Protocol
.	O
</s>
<s>
Neither	O
CSS1	B-Language
(	O
1996	O
)	O
nor	O
CSS2	B-Language
(	O
1998	O
)	O
specifications	O
are	O
fully	O
implemented	O
and	O
many	O
CSS	B-Language
properties	O
can	O
only	O
to	O
be	O
used	O
with	O
certain	O
HTML	B-Language
elements	O
for	O
the	O
desired	O
effect	O
.	O
</s>
<s>
Some	O
HTML	B-Language
attributes	O
help	O
achieve	O
proper	O
rendering	O
of	O
e-mails	O
in	O
Outlook	O
,	O
but	O
most	O
of	O
these	O
attributes	O
are	O
already	O
deprecated	O
in	O
the	O
HTML	B-Language
4.0	I-Language
specifications	O
(	O
1997	O
)	O
.	O
</s>
<s>
In	O
order	O
to	O
achieve	O
the	O
best	O
compatibility	O
with	O
Outlook	O
,	O
most	O
HTML	B-Language
e-mails	O
are	O
created	O
using	O
multiple	O
boxed	O
tables	O
,	O
as	O
the	O
table	O
element	O
and	O
its	O
sub-elements	O
support	O
the	O
width	O
and	O
height	O
property	O
in	O
Outlook	O
.	O
</s>
<s>
No	O
improvements	O
have	O
been	O
made	O
towards	O
a	O
more	O
standards-compliant	O
email	B-Protocol
client	I-Protocol
since	O
the	O
release	O
of	O
Outlook	B-Application
2007	I-Application
.	O
</s>
<s>
Outlook	O
and	O
Exchange	B-Operating_System
Server	I-Operating_System
internally	O
handle	O
messages	O
,	O
appointments	O
,	O
and	O
items	O
as	O
objects	O
in	O
a	O
data	O
model	O
which	O
is	O
derived	O
from	O
the	O
old	O
proprietary	B-Application
Microsoft	B-Application
Mail	I-Application
system	O
,	O
the	O
Rich	O
Text	O
Format	O
from	O
Microsoft	B-Application
Word	I-Application
and	O
the	O
complex	O
OLE	B-Operating_System
general	O
data	O
model	O
.	O
</s>
<s>
When	O
these	O
programs	O
interface	O
with	O
other	O
protocols	O
such	O
as	O
the	O
various	O
Internet	O
and	O
X.400	B-Protocol
protocols	O
,	O
they	O
try	O
to	O
map	O
this	O
internal	O
model	O
onto	O
those	O
protocols	O
in	O
a	O
way	O
that	O
can	O
be	O
reversed	O
if	O
the	O
ultimate	O
recipient	O
is	O
also	O
running	O
Outlook	O
or	O
Exchange	B-Operating_System
.	O
</s>
<s>
This	O
focus	O
on	O
the	O
possibility	O
that	O
emails	O
and	O
other	O
items	O
will	O
ultimately	O
be	O
converted	O
back	O
to	O
Microsoft	B-Application
Mail	I-Application
format	O
is	O
so	O
extreme	O
that	O
if	O
Outlook/Exchange	O
cannot	O
figure	O
out	O
a	O
way	O
to	O
encode	O
the	O
complete	O
data	O
in	O
the	O
standard	O
format	O
,	O
it	O
simply	O
encodes	O
the	O
entire	O
message/item	O
in	O
a	O
proprietary	B-Application
binary	O
format	O
called	O
Transport	O
Neutral	O
Encapsulation	O
Format	O
(	O
TNEF	O
)	O
and	O
sends	O
this	O
as	O
an	O
attached	O
file	O
(	O
usually	O
named	O
"	O
winmail.dat	O
"	O
)	O
to	O
an	O
otherwise	O
incomplete	O
rendering	O
of	O
the	O
mail/item	O
.	O
</s>
<s>
If	O
the	O
recipient	O
is	O
Outlook/Exchange	O
it	O
can	O
simply	O
discard	O
the	O
incomplete	O
outer	O
message	O
and	O
use	O
the	O
encapsulated	O
data	O
directly	O
,	O
but	O
if	O
the	O
recipient	O
is	O
any	O
other	O
program	O
,	O
the	O
message	O
received	O
will	O
be	O
incomplete	O
because	O
the	O
data	O
in	O
the	O
TNEF	O
attachment	O
will	O
be	O
of	O
little	O
use	O
without	O
the	O
Microsoft	O
software	O
for	O
which	O
it	O
was	O
created	O
.	O
</s>
<s>
Outlook	O
does	O
not	O
fully	O
support	O
data	O
and	O
syncing	O
specifications	O
for	O
calendaring	B-Application
and	O
contacts	O
,	O
such	O
as	O
iCalendar	O
,	O
CalDAV	B-Protocol
,	O
SyncML	B-General_Concept
,	O
and	O
vCard	O
3.0	O
.	O
</s>
<s>
Outlook	B-Application
2007	I-Application
claims	O
to	O
be	O
fully	O
iCalendar	O
compliant	O
;	O
however	O
,	O
it	O
does	O
not	O
support	O
all	O
core	O
objects	O
,	O
such	O
as	O
VTODO	O
or	O
VJOURNAL	O
.	O
</s>
<s>
Outlook	O
has	O
also	O
been	O
criticized	O
for	O
having	O
proprietary	B-Application
"	O
Outlook	O
extensions	O
"	O
to	O
these	O
Internet	O
standards	O
.	O
</s>
<s>
Outlook	O
(	O
both	O
the	O
web	O
version	O
and	O
recent	O
non-web	O
versions	O
)	O
promotes	O
the	O
usage	O
of	O
a	O
proprietary	B-Application
.msg	O
format	O
to	O
save	O
individual	O
emails	O
,	O
instead	O
of	O
the	O
standard	O
.eml	O
format	O
.	O
</s>
<s>
The	O
standard	O
.eml	O
format	O
replicates	O
the	O
format	O
of	O
emails	O
as	O
used	O
for	O
transmission	O
and	O
is	O
therefore	O
compatible	O
with	O
any	O
email	B-Protocol
client	I-Protocol
which	O
uses	O
the	O
normal	O
protocols	O
.	O
</s>
<s>
Standard-compliant	O
email	B-Protocol
clients	I-Protocol
,	O
like	O
Mozilla	B-Application
Thunderbird	I-Application
,	O
use	O
additional	O
headers	O
to	O
store	O
software-specific	O
information	O
related	O
e.g.	O
</s>
<s>
to	O
the	O
local	O
storage	O
of	O
the	O
email	O
,	O
while	O
keeping	O
the	O
file	O
plain-text	O
,	O
so	O
that	O
it	O
can	O
be	O
read	O
in	O
any	O
text	B-Application
editor	I-Application
and	O
searched	O
or	O
indexed	O
like	O
any	O
document	O
by	O
any	O
other	O
software	O
.	O
</s>
<s>
As	O
part	O
of	O
its	O
Trustworthy	O
Computing	O
initiative	O
,	O
Microsoft	O
took	O
corrective	O
steps	O
to	O
fix	O
Outlook	O
's	O
reputation	O
in	O
Office	O
Outlook	B-Application
2003	I-Application
.	O
</s>
<s>
Among	O
the	O
most	O
publicized	O
security	O
features	O
are	O
that	O
Office	O
Outlook	B-Application
2003	I-Application
does	O
not	O
automatically	O
load	O
images	O
in	O
HTML	B-Language
emails	O
or	O
permit	O
opening	O
executable	O
attachments	O
by	O
default	O
,	O
and	O
includes	O
a	O
built-in	O
Junk	O
Mail	O
filter	O
.	O
</s>
<s>
Outlook	O
add-ins	B-Application
are	O
small	O
additional	O
programs	O
for	O
the	O
Microsoft	B-Application
Outlook	I-Application
application	O
,	O
mainly	O
purposed	O
to	O
add	O
new	O
functional	O
capabilities	O
into	O
Outlook	O
and	O
automate	O
various	O
routine	O
operations	O
.	O
</s>
<s>
The	O
term	O
also	O
refers	O
to	O
programs	O
where	O
the	O
main	O
function	O
is	O
to	O
work	O
on	O
Outlook	O
files	O
,	O
such	O
as	O
synchronization	O
or	O
backup	B-Protocol
utilities	I-Protocol
.	O
</s>
<s>
Outlook	O
add-ins	B-Application
may	O
be	O
developed	O
in	O
Microsoft	B-Application
Visual	I-Application
Studio	I-Application
or	O
third-party	O
tools	O
such	O
as	O
Add-in	B-Application
Express	O
.	O
</s>
<s>
Outlook	O
add-ins	B-Application
are	O
not	O
supported	O
in	O
Outlook	B-Protocol
Web	I-Protocol
App	I-Protocol
.	O
</s>
<s>
From	O
Outlook	O
97	O
on	O
,	O
Exchange	B-Operating_System
Client	I-Operating_System
Extensions	O
are	O
supported	O
in	O
Outlook	O
.	O
</s>
<s>
Outlook	B-Application
2000	I-Application
and	O
later	O
support	O
specific	O
COM	B-Application
components	O
called	O
Outlook	O
Add-Ins	B-Application
.	O
</s>
<s>
The	O
exact	O
supported	O
features	O
(	O
such	O
as	O
.NET	B-Application
components	O
)	O
for	O
later	O
generations	O
were	O
extended	O
with	O
each	O
release	O
.	O
</s>
<s>
In	O
March	O
2016	O
,	O
Salesforce	B-Application
announced	O
that	O
its	O
relationship	O
intelligence	O
platform	O
,	O
SalesforceIQ	B-Application
,	O
would	O
be	O
able	O
to	O
seamlessly	O
integrate	O
with	O
Outlook	O
.	O
</s>
<s>
SalesforceIQ	B-Application
works	O
from	O
inside	O
the	O
Outlook	O
inbox	O
providing	O
data	O
from	O
CRM	O
,	O
email	O
,	O
and	O
customer	O
social	O
profiles	O
.	O
</s>
<s>
It	O
also	O
provides	O
recommendations	O
within	O
the	O
inbox	O
on	O
various	O
aspects	O
like	O
appointment	B-Application
scheduling	I-Application
,	O
contacts	O
,	O
responses	O
,	O
etc	O
.	O
</s>
<s>
Microsoft	B-Application
Outlook	I-Application
Hotmail	B-Operating_System
Connector	O
(	O
formerly	O
Microsoft	B-Application
Office	I-Application
Outlook	I-Application
Connector	O
)	O
,	O
is	O
a	O
discontinued	O
and	O
defunct	O
free	O
add-in	B-Application
for	O
Microsoft	B-Application
Outlook	I-Application
2003	O
,	O
2007	O
and	O
2010	O
,	O
intended	O
to	O
integrate	O
Outlook.com	B-Operating_System
(	O
formerly	O
Hotmail	B-Operating_System
)	O
into	O
Microsoft	B-Application
Outlook	I-Application
.	O
</s>
<s>
It	O
uses	O
DeltaSync	B-Device
,	O
a	O
proprietary	B-Application
Microsoft	O
communications	O
protocol	O
that	O
Hotmail	B-Operating_System
formerly	O
used	O
.	O
</s>
<s>
In	O
version	O
12	O
,	O
access	O
to	O
tasks	O
and	O
notes	O
and	O
online	O
synchronization	O
with	O
MSN	B-Protocol
Calendar	B-Operating_System
is	O
only	O
available	O
to	O
MSN	B-Protocol
subscribers	O
of	O
paid	O
premium	O
accounts	O
.	O
</s>
<s>
Version	O
12.1	O
,	O
released	O
in	O
December	O
2008	O
as	O
an	O
optional	O
upgrade	O
,	O
uses	O
Windows	O
Live	O
Calendar	B-Operating_System
instead	O
of	O
the	O
former	O
MSN	B-Protocol
Calendar	B-Operating_System
.	O
</s>
<s>
This	O
meant	O
that	O
calendar	B-Operating_System
features	O
became	O
free	O
for	O
all	O
users	O
,	O
except	O
for	O
task	O
synchronization	O
which	O
became	O
unavailable	O
.	O
</s>
<s>
In	O
April	O
2008	O
,	O
version	O
12.1	O
became	O
a	O
required	O
upgrade	O
to	O
continue	O
using	O
the	O
service	O
as	O
part	O
of	O
a	O
migration	O
from	O
MSN	B-Protocol
Calendar	B-Operating_System
to	O
Windows	O
Live	O
Calendar	B-Operating_System
.	O
</s>
<s>
Microsoft	B-Application
Outlook	I-Application
2013	O
and	O
later	O
have	O
intrinsic	O
support	O
for	O
accessing	O
Outlook.com	B-Operating_System
and	O
its	O
calendar	B-Operating_System
over	O
the	O
Exchange	B-Protocol
ActiveSync	I-Protocol
(	O
EAS	O
)	O
protocol	O
,	O
while	O
older	O
versions	O
of	O
Microsoft	B-Application
Outlook	I-Application
can	O
read	O
and	O
synchronize	O
Outlook.com	B-Operating_System
emails	O
over	O
the	O
IMAP	B-Protocol
protocol	O
.	O
</s>
<s>
Outlook	O
Social	O
Connector	O
was	O
a	O
free	O
add-in	B-Application
for	O
Microsoft	B-Application
Outlook	I-Application
2003	O
and	O
2007	O
by	O
Microsoft	O
that	O
allowed	O
integration	O
of	O
social	O
networks	O
such	O
as	O
Facebook	B-Application
,	O
LinkedIn	B-Application
and	O
Windows	B-Protocol
Live	I-Protocol
Messenger	I-Protocol
into	O
Microsoft	B-Application
Outlook	I-Application
.	O
</s>
<s>
Starting	O
with	O
Microsoft	B-Operating_System
Office	I-Operating_System
2010	I-Operating_System
,	O
Outlook	O
Social	O
Connector	O
is	O
an	O
integral	O
part	O
of	O
Outlook	O
.	O
</s>
<s>
Since	O
Microsoft	B-Application
Outlook	I-Application
does	O
not	O
support	O
CalDAV	B-Protocol
and	O
CardDAV	B-Protocol
protocol	O
along	O
the	O
way	O
,	O
various	O
third-party	O
software	O
vendors	O
developed	O
Outlook	O
add-ins	B-Application
to	O
enable	O
users	O
synchronizing	O
with	O
CalDAV	B-Protocol
and	O
CardDAV	B-Protocol
servers	O
.	O
</s>
<s>
CalConnect	O
has	O
a	O
list	O
of	O
software	O
that	O
enable	O
users	O
to	O
synchronize	O
their	O
calendars	B-Operating_System
with	O
CalDAV	B-Protocol
servers/contacts	O
with	O
CardDAV	B-Protocol
servers	O
.	O
</s>
<s>
Traditionally	O
,	O
Outlook	O
supported	O
importing	O
messages	O
from	O
Outlook	B-Application
Express	I-Application
and	O
Lotus	B-Operating_System
Notes	I-Operating_System
.	O
</s>
<s>
In	O
addition	O
,	O
Microsoft	B-Application
Outlook	I-Application
supports	O
POP3	B-Protocol
and	O
IMAP	B-Protocol
protocols	O
,	O
enabling	O
users	O
to	O
import	O
emails	O
from	O
servers	O
that	O
support	O
these	O
protocols	O
.	O
</s>
<s>
Microsoft	B-Operating_System
Hotmail	I-Operating_System
Connector	O
add-in	B-Application
(	O
described	O
above	O
)	O
helps	O
importing	O
emails	O
from	O
Hotmail	B-Operating_System
accounts	O
.	O
</s>
<s>
Outlook	B-Operating_System
2013	I-Operating_System
later	O
integrated	O
the	O
functionality	O
of	O
this	O
add-in	B-Application
and	O
added	O
the	O
ability	O
to	O
import	O
email	O
(	O
as	O
well	O
as	O
a	O
calendar	B-Operating_System
)	O
through	O
Exchange	B-Protocol
ActiveSync	I-Protocol
protocol	O
.	O
</s>
<s>
There	O
are	O
some	O
ways	O
to	O
get	O
the	O
emails	O
from	O
Thunderbird	B-Application
;	O
the	O
first	O
is	O
to	O
use	O
a	O
tool	O
that	O
can	O
convert	O
a	O
Thunderbird	B-Application
folder	O
to	O
a	O
format	O
that	O
can	O
be	O
imported	O
from	O
Outlook	B-Application
Express	I-Application
.	O
</s>
<s>
If	O
Exchange	B-Operating_System
is	O
available	O
,	O
an	O
easier	O
method	O
is	O
to	O
connect	O
the	O
old	O
mail	B-Protocol
client	I-Protocol
(	O
Thunderbird	B-Application
)	O
to	O
Exchange	B-Operating_System
using	O
IMAP	B-Protocol
,	O
and	O
upload	O
the	O
original	O
mail	O
from	O
the	O
client	O
to	O
the	O
Exchange	B-Operating_System
account	O
.	O
</s>
