<s>
Microsoft	B-General_Concept
Virtual	I-General_Concept
Server	I-General_Concept
was	O
a	O
virtualization	O
solution	O
that	O
facilitated	O
the	O
creation	O
of	O
virtual	B-Architecture
machines	I-Architecture
on	O
the	O
Windows	B-Application
XP	I-Application
,	O
Windows	B-Application
Vista	I-Application
and	O
Windows	B-Application
Server	I-Application
2003	I-Application
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
Virtual	B-Application
PC	I-Application
is	O
Microsoft	O
's	O
related	O
desktop	O
virtualization	O
software	O
package	O
.	O
</s>
<s>
Virtual	B-Architecture
machines	I-Architecture
are	O
created	O
and	O
managed	O
through	O
a	O
Web-based	O
interface	O
that	O
relies	O
on	O
Internet	B-Application
Information	I-Application
Services	I-Application
(	O
IIS	O
)	O
or	O
through	O
a	O
Windows	O
client	O
application	O
tool	O
called	O
VMRCplus	O
.	O
</s>
<s>
The	O
last	O
version	O
using	O
this	O
name	O
was	O
Microsoft	B-General_Concept
Virtual	I-General_Concept
Server	I-General_Concept
2005	O
R2	O
SP1	O
.	O
</s>
<s>
New	O
features	O
in	O
R2	O
SP1	O
include	O
Linux	B-Application
guest	O
operating	B-General_Concept
system	I-General_Concept
support	O
,	O
Virtual	O
Disk	O
Precompactor	O
,	O
SMP	B-Operating_System
(	O
but	O
not	O
for	O
the	O
guest	O
OS	O
)	O
,	O
x64	B-Device
host	O
operating	B-General_Concept
system	I-General_Concept
support	O
,	O
the	O
ability	O
to	O
mount	O
virtual	O
hard	O
drives	O
on	O
the	O
host	B-Operating_System
machine	I-Operating_System
and	O
additional	O
operating	B-General_Concept
systems	I-General_Concept
support	O
,	O
including	O
Windows	B-Application
Vista	I-Application
.	O
</s>
<s>
It	O
also	O
provides	O
a	O
Volume	O
Shadow	O
Copy	O
writer	O
that	O
enables	O
live	O
backups	O
of	O
the	O
Guest	O
OS	O
on	O
a	O
Windows	B-Application
Server	I-Application
2003	I-Application
or	O
Windows	B-Device
Server	I-Device
2008	I-Device
host	O
.	O
</s>
<s>
Virtual	B-Architecture
Machine	I-Architecture
Additions	O
for	O
Linux	B-Application
are	O
available	O
as	O
a	O
free	O
download	O
.	O
</s>
<s>
Officially	O
supported	O
Linux	B-Application
guest	O
operating	B-General_Concept
systems	I-General_Concept
include	O
Red	O
Hat	O
Enterprise	O
Linux	B-Application
versions	O
2.1-5.0	O
,	O
Red	O
Hat	O
Linux	B-Application
9.0	O
,	O
SUSE	O
Linux	B-Application
and	O
SUSE	O
Linux	B-Application
Enterprise	O
Server	O
versions	O
9	O
and	O
10	O
.	O
</s>
<s>
VPC	O
will	O
install	O
on	O
Windows	O
7	O
,	O
but	O
Virtual	O
Server	O
is	O
restricted	O
from	O
install	O
on	O
NT	O
6.1	O
or	O
higher	O
operating	B-General_Concept
systems	I-General_Concept
i.e.	O
</s>
<s>
Server	B-Device
2008	I-Device
R2	O
and	O
Windows	O
7	O
.	O
</s>
<s>
Virtual	B-General_Concept
Server	I-General_Concept
2005	I-General_Concept
was	O
available	O
in	O
two	O
editions	O
:	O
Standard	O
and	O
Enterprise	O
.	O
</s>
<s>
The	O
Standard	O
edition	O
was	O
limited	O
to	O
a	O
maximum	O
4	O
processors	O
for	O
the	O
host	O
operating	B-General_Concept
system	I-General_Concept
while	O
the	O
Enterprise	O
edition	O
was	O
not	O
.	O
</s>
<s>
On	O
2006-04-03	O
,	O
Microsoft	O
made	O
Virtual	B-General_Concept
Server	I-General_Concept
2005	I-General_Concept
R2	I-General_Concept
Enterprise	O
Edition	O
a	O
free	O
download	O
,	O
in	O
order	O
to	O
better	O
compete	O
with	O
the	O
free	O
virtualization	O
offerings	O
from	O
VMware	O
and	O
Xen	B-Operating_System
,	O
and	O
discontinued	O
the	O
Standard	O
Edition	O
.	O
</s>
<s>
Microsoft	B-General_Concept
Virtual	I-General_Concept
Server	I-General_Concept
R2	O
SP1	O
added	O
support	O
for	O
both	O
Intel	O
VT	O
(	O
IVT	O
)	O
and	O
AMD	O
Virtualization	O
(	O
AMD-V	O
)	O
.	O
</s>
<s>
Will	O
not	O
install	O
on	O
Windows	O
7	O
and	O
Server	B-Device
2008	I-Device
R2	O
or	O
newer	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
Upgrades	O
from	O
Vista/Server2008	O
can	O
be	O
patched	O
.	O
</s>
<s>
Although	O
Virtual	B-General_Concept
Server	I-General_Concept
2005	I-General_Concept
R2	I-General_Concept
can	O
run	O
on	O
hosts	O
with	O
x86-64	B-Device
processors	O
,	O
it	O
cannot	O
run	O
x64	B-Device
guests	O
that	O
require	O
x86-64	B-Device
processors	O
(	O
guests	O
cannot	O
be	O
64-bit	O
)	O
.	O
</s>
<s>
It	O
also	O
makes	O
use	O
of	O
SMP	B-Operating_System
,	O
but	O
does	O
not	O
virtualize	O
it	O
(	O
it	O
does	O
not	O
allow	O
guests	O
to	O
use	O
more	O
than	O
1	O
CPU	O
each	O
)	O
.	O
</s>
