<s>
Office	B-Operating_System
Genuine	I-Operating_System
Advantage	I-Operating_System
(	O
OGA	O
)	O
was	O
a	O
program	O
by	O
Microsoft	O
,	O
similar	O
to	O
Windows	O
Genuine	O
Advantage	O
(	O
WGA	O
)	O
,	O
which	O
required	O
users	O
of	O
the	O
Microsoft	B-Application
Office	I-Application
software	O
to	O
validate	O
their	O
copy	O
of	O
Microsoft	B-Application
Office	I-Application
to	O
download	O
non-critical	O
updates	O
and	O
other	O
downloads	O
such	O
as	O
addons	O
and	O
samples	O
.	O
</s>
<s>
On	O
April	O
15	O
,	O
2008	O
,	O
Microsoft	O
released	O
Office	B-Operating_System
Genuine	I-Operating_System
Advantage	I-Operating_System
Notifications	O
to	O
Windows	O
Server	O
Update	O
Services	O
as	O
KB949810	O
.	O
</s>
<s>
On	O
December	O
17	O
,	O
2010	O
,	O
Microsoft	O
retired	O
Office	B-Operating_System
Genuine	I-Operating_System
Advantage	I-Operating_System
.	O
</s>
<s>
The	O
Office	B-Operating_System
Genuine	I-Operating_System
Advantage	I-Operating_System
article	O
on	O
Microsoft	O
support	O
website	O
was	O
updated	O
to	O
reflect	O
this	O
.	O
</s>
