<s>
Microsoft	B-Application
Media	I-Application
Server	I-Application
(	O
MMS	O
)	O
,	O
a	O
Microsoft	O
proprietary	O
network-streaming	O
protocol	O
,	O
serves	O
to	O
transfer	O
unicast	B-Protocol
data	O
in	O
Windows	B-Device
Media	I-Device
Services	I-Device
(	O
previously	O
called	O
NetShow	O
Services	O
)	O
.	O
</s>
<s>
MMS	O
can	O
be	O
transported	O
via	O
UDP	B-Protocol
or	O
TCP	B-Protocol
.	O
</s>
<s>
The	O
MMS	O
default	O
port	B-Protocol
is	O
UDP/TCP	B-Protocol
1755	I-Protocol
.	O
</s>
<s>
Microsoft	O
deprecated	O
MMS	O
in	O
favor	O
of	O
RTSP	B-Protocol
(	O
TCP/UDP	O
port	O
554	O
)	O
in	O
2003	O
with	O
the	O
release	O
of	O
the	O
Windows	B-Device
Media	I-Device
Services	I-Device
9	O
Series	O
,	O
but	O
continued	O
to	O
support	O
the	O
MMS	O
for	O
some	O
time	O
in	O
the	O
interest	O
of	O
backward	B-General_Concept
compatibility	I-General_Concept
.	O
</s>
<s>
Support	O
for	O
the	O
protocol	O
was	O
finally	O
dropped	O
in	O
Windows	B-Device
Media	I-Device
Services	I-Device
2008	O
.	O
</s>
<s>
As	O
part	O
of	O
protocol	O
rollover	O
a	O
Windows	B-Device
Media	I-Device
Player	I-Device
version	O
9	O
,	O
10	O
,	O
or	O
11	O
client	O
opening	O
an	O
""	O
URL	O
will	O
attempt	O
to	O
connect	O
first	O
with	O
RTSP	B-Protocol
over	O
UDP	B-Protocol
and	O
if	O
that	O
fails	O
it	O
will	O
attempt	O
RTSP	B-Protocol
over	O
TCP	B-Protocol
.	O
</s>
<s>
After	O
an	O
RTSP	B-Protocol
attempt	O
fails	O
,	O
Windows	B-Device
Media	I-Device
Player	I-Device
versions	O
9	O
and	O
10	O
will	O
attempt	O
MMS	O
over	O
UDP	B-Protocol
,	O
then	O
MMS	O
over	O
TCP	B-Protocol
.	O
</s>
<s>
If	O
using	O
Windows	B-Device
Media	I-Device
Player	I-Device
11	I-Device
and	O
an	O
RTSP	B-Protocol
attempt	O
fails	O
,	O
or	O
if	O
using	O
a	O
previous	O
version	O
of	O
Windows	B-Device
Media	I-Device
Player	I-Device
and	O
MMS	O
fails	O
,	O
a	O
modified	O
version	O
of	O
a	O
HTTP	B-Protocol
over	O
TCP	B-Protocol
connection	O
will	O
be	O
attempted	O
.	O
</s>
<s>
This	O
modified	O
version	O
is	O
referred	O
to	O
by	O
some	O
third	O
parties	O
as	O
MMSH	B-Application
,	O
and	O
by	O
Microsoft	O
as	O
MS-WMSP	O
(	O
Windows	O
Media	O
HTTP	B-Protocol
Streaming	O
Protocol	O
)	O
.	O
</s>
<s>
The	O
uniform	B-Protocol
resource	I-Protocol
identifier	I-Protocol
(	O
URI	B-Protocol
)	O
scheme	O
mms	O
has	O
also	O
been	O
proposed	O
to	O
be	O
used	O
for	O
the	O
unrelated	O
Multimedia	O
Messaging	O
Service	O
(	O
MMS	O
)	O
protocol	O
.	O
</s>
<s>
For	O
several	O
years	O
developers	O
of	O
the	O
SDP	O
Multimedia	O
download-tool	O
reverse	O
engineered	O
the	O
MMS	B-Application
protocol	I-Application
and	O
published	O
unofficial	O
documentation	O
for	O
it	O
.	O
</s>
