<s>
Windows	B-Application
Messaging	I-Application
,	O
initially	O
called	O
Microsoft	B-Application
Exchange	I-Application
Client	I-Application
,	O
is	O
an	O
email	B-Protocol
client	I-Protocol
that	O
was	O
included	O
with	O
Windows	B-Application
95	I-Application
(	O
beginning	O
with	O
OSR2	O
)	O
,	O
Windows	B-Device
98	I-Device
,	O
and	O
Windows	B-Device
NT	I-Device
4.0	I-Device
.	O
</s>
<s>
In	O
Windows	B-Device
98	I-Device
,	O
it	O
was	O
not	O
installed	O
by	O
default	O
but	O
was	O
available	O
as	O
a	O
separate	O
program	O
in	O
the	O
setup	O
CD	O
.	O
</s>
<s>
Microsoft	O
Exchange	O
gained	O
wide	O
usage	O
with	O
the	O
release	O
of	O
Windows	B-Application
95	I-Application
,	O
as	O
this	O
was	O
the	O
only	O
mail	B-Protocol
client	I-Protocol
that	O
came	O
bundled	O
with	O
it	O
.	O
</s>
<s>
In	O
1996	O
,	O
it	O
was	O
renamed	O
to	O
Windows	B-Application
Messaging	I-Application
,	O
because	O
of	O
the	O
upcoming	O
release	O
of	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
Server	I-Operating_System
,	O
and	O
continued	O
to	O
be	O
included	O
throughout	O
later	O
releases	O
of	O
Windows	O
up	O
until	O
the	O
initial	O
release	O
of	O
Windows	B-Device
98	I-Device
,	O
which	O
by	O
then	O
included	O
Outlook	B-Application
Express	I-Application
4.0	O
as	O
the	O
default	O
mail	B-Protocol
client	I-Protocol
.	O
</s>
<s>
The	O
Windows	B-Application
Messaging	I-Application
email	B-Protocol
client	I-Protocol
had	O
two	O
branches	O
of	O
successors	O
:	O
</s>
<s>
In	O
software	O
bundled	O
with	O
Windows	O
itself	O
,	O
these	O
were	O
Internet	B-Application
Mail	I-Application
and	I-Application
News	I-Application
in	O
Windows	B-Application
95	I-Application
(	O
and	O
bundled	O
with	O
Internet	B-Protocol
Explorer	I-Protocol
3	I-Protocol
)	O
,	O
which	O
was	O
succeeded	O
by	O
Outlook	B-Application
Express	I-Application
4.0	O
in	O
Windows	B-Device
98	I-Device
(	O
bundled	O
with	O
Internet	B-Protocol
Explorer	I-Protocol
4.0	I-Protocol
in	O
Windows	B-Application
95	I-Application
)	O
and	O
throughout	O
newer	O
Windows	O
systems	O
.	O
</s>
<s>
These	O
did	O
not	O
use	O
the	O
.pst	B-Operating_System
file	I-Operating_System
type	O
.	O
</s>
<s>
Microsoft	B-Application
Outlook	I-Application
became	O
the	O
professional-grade	O
and	O
more	O
direct	O
successor	O
of	O
MS	O
Exchange	O
Client	O
,	O
which	O
still	O
uses	O
the	O
.pst	B-Operating_System
file	I-Operating_System
type	O
.	O
</s>
<s>
Microsoft	O
Fax	O
,	O
also	O
called	O
Microsoft	O
at	O
Work	O
Fax	O
(	O
AWF	O
)	O
,	O
is	O
the	O
fax	O
component	O
to	O
provide	O
Send-and-Receive	O
Fax	O
capability	O
;	O
sent	O
and	O
received	O
faxes	O
were	O
stored	O
in	O
the	O
same	O
.pst	B-Operating_System
file	I-Operating_System
as	O
other	O
messages	O
,	O
the	O
first	O
attempt	O
of	O
unified	O
messaging	O
by	O
Microsoft	O
;	O
also	O
the	O
ability	O
to	O
act	O
as	O
fax	B-Application
server	I-Application
,	O
which	O
is	O
not	O
available	O
in	O
later	O
versions	O
of	O
Windows	O
until	O
Windows	B-Application
Vista	I-Application
.	O
</s>
