<s>
Microsoft	B-Application
Windows	I-Application
Malicious	I-Application
Software	I-Application
Removal	I-Application
Tool	I-Application
(	O
MSRT	O
)	O
is	O
a	O
freeware	B-License
second-opinion	B-Application
malware	I-Application
scanner	I-Application
that	O
Microsoft	O
's	O
Windows	O
Update	O
downloads	O
and	O
runs	O
on	O
Windows	O
computers	O
each	O
month	O
,	O
independent	O
of	O
the	O
install	O
antivirus	B-Application
software	I-Application
.	O
</s>
<s>
Although	O
Windows	B-Application
XP	I-Application
support	O
ended	O
on	O
April	O
8	O
,	O
2014	O
,	O
updates	O
for	O
the	O
Windows	B-Application
XP	I-Application
version	I-Application
of	O
the	O
Malicious	B-Application
Software	I-Application
Removal	I-Application
Tool	I-Application
would	O
be	O
provided	O
until	O
August	O
,	O
2016	O
;	O
version	O
5.39	O
.	O
</s>
<s>
Despite	O
Microsoft	O
ending	O
general	O
support	O
for	O
the	O
Windows	B-Device
7	I-Device
operating	O
system	O
in	O
2020	O
,	O
updates	O
are	O
still	O
provided	O
to	O
Windows	B-Device
7	I-Device
users	O
via	O
the	O
standard	O
Windows	O
Update	O
delivery	O
mechanism	O
.	O
</s>
<s>
In	O
August	O
2013	O
,	O
the	O
Malicious	B-Application
Software	I-Application
Removal	I-Application
Tool	I-Application
deleted	O
old	O
,	O
vulnerable	O
versions	O
of	O
the	O
Tor	B-Application
client	O
to	O
end	O
the	O
spread	O
of	O
the	O
Sefnit	B-Application
botnet	O
(	O
which	O
mined	O
for	O
bitcoins	B-Protocol
without	O
the	O
host	O
owner	O
's	O
approval	O
and	O
later	O
engaged	O
in	O
click	O
fraud	O
)	O
.	O
</s>
