If your question refers to service pack 3 it is that lastest upgrades to the original operating system
for example win xp came out as win xp
later on in it's life a service pack 1 then 2 and finally a service pack 3 was issued where by all the updates were in a pack so that if you had win xp disc and installed it , then you could install service pack 3 and the operating system was up to date
xp is now no longer supported by microsoft and is rapidly falling out of service
win 7 is now up to service pack 1 ( last time I looked ) but with the large amounts of installing up dates , it may be around pack 2
.with the release of win 10 , win 7 will be no longer supported after a period of time
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