<s>
The	O
Shared	B-Application
Source	I-Application
Common	I-Application
Language	I-Application
Infrastructure	I-Application
(	O
SSCLI	B-Application
)	O
,	O
previously	O
codenamed	O
Rotor	B-Application
,	O
is	O
Microsoft	O
's	O
shared	B-License
source	I-License
implementation	O
of	O
the	O
CLI	O
,	O
the	O
core	O
of	O
.NET	B-Application
.	O
</s>
<s>
Although	O
the	O
SSCLI	B-Application
is	O
not	O
suitable	O
for	O
commercial	O
use	O
due	O
to	O
its	O
license	O
,	O
it	O
does	O
make	O
it	O
possible	O
for	O
programmers	B-Application
to	O
examine	O
the	O
implementation	O
details	O
of	O
many	O
.NET	B-Application
libraries	O
and	O
to	O
create	O
modified	O
CLI	O
versions	O
.	O
</s>
<s>
Microsoft	O
provides	O
the	O
Shared	B-Application
Source	I-Application
CLI	I-Application
as	O
a	O
reference	O
CLI	O
implementation	O
suitable	O
for	O
educational	O
use	O
.	O
</s>
<s>
Beginning	O
in	O
2001	O
,	O
Microsoft	O
announced	O
they	O
would	O
release	O
part	O
of	O
the	O
.NET	B-Application
Framework	I-Application
infrastructure	O
source	O
code	O
in	O
Shared	B-License
source	I-License
through	O
ECMA	O
,	O
as	O
part	O
of	O
the	O
C#	B-Application
and	O
CLI	O
standardization	O
process	O
.	O
</s>
<s>
In	O
March	O
2002	O
,	O
Microsoft	O
released	O
version	O
1.0	O
of	O
the	O
Shared	B-Application
Source	I-Application
Common	I-Application
Language	I-Application
Infrastructure	I-Application
,	O
also	O
called	O
Rotor	B-Application
.	O
</s>
<s>
The	O
Shared	B-Application
Source	I-Application
CLI	I-Application
was	O
initially	O
pre-configured	O
to	O
run	O
on	O
Windows	B-Application
,	O
but	O
could	O
also	O
be	O
built	O
on	O
FreeBSD	B-Operating_System
(	O
version	O
4.7	O
or	O
newer	O
)	O
,	O
and	O
Mac	O
OS	O
X	O
10.2	O
.	O
</s>
<s>
It	O
was	O
designed	O
such	O
that	O
the	O
only	O
thing	O
that	O
needed	O
to	O
be	O
customized	O
to	O
port	O
the	O
Shared	B-Application
Source	I-Application
CLI	I-Application
to	O
a	O
different	O
platform	O
was	O
a	O
thin	O
Platform	B-Architecture
Abstraction	I-Architecture
Layer	I-Architecture
(	O
PAL	O
)	O
.	O
</s>
<s>
The	O
last	O
2.0	O
version	O
of	O
SSCLI	B-Application
was	O
released	O
in	O
March	O
2006	O
,	O
and	O
contains	O
most	O
of	O
the	O
classes	O
and	O
features	O
of	O
version	O
2.0	O
of	O
the	O
.NET	B-Application
Framework	I-Application
.	O
</s>
<s>
SSCLI	B-Application
2.0	O
can	O
be	O
downloaded	O
directly	O
from	O
Microsoft	O
downloads	O
and	O
requires	O
Perl	B-Language
and	O
Visual	B-Application
Studio	I-Application
2005	O
running	O
on	O
Windows	B-Application
XP	O
SP2	O
to	O
compile	O
.	O
</s>
<s>
Even	O
Microsoft	O
MVPs	O
,	O
important	O
part	O
of	O
Microsoft	O
community	O
ecosystem	O
,	O
complained	O
about	O
the	O
lack	O
of	O
support	O
for	O
other	O
Visual	B-Application
Studio	I-Application
versions	O
and	O
operating	O
systems	O
.	O
</s>
<s>
However	O
,	O
a	O
non-official	O
patch	O
for	O
Visual	B-Application
Studio	I-Application
2008	I-Application
was	O
provided	O
by	O
a	O
Microsoft	O
employee	O
in	O
the	O
MSDN	O
Blog	O
and	O
another	O
for	O
Visual	B-Application
Studio	I-Application
2010	O
was	O
released	O
by	O
the	O
community	O
.	O
</s>
<s>
Later	O
versions	O
of	O
.NET	B-Application
,	O
originally	O
known	O
as	O
.NET	B-Application
Core	I-Application
and	O
now	O
referred	O
to	O
simply	O
as	O
.NET	B-Application
,	O
have	O
been	O
open	O
sourced	O
under	O
the	O
more	O
permissive	O
MIT	B-License
license	I-License
.	O
</s>
<s>
The	O
Shared	B-Application
Source	I-Application
CLI	I-Application
use	O
the	O
non-free	O
Microsoft	O
Shared	B-Application
Source	I-Application
Common	I-Application
Language	I-Application
Infrastructure	I-Application
license	O
.	O
</s>
