Windows Identity SID

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Does SID for a windows account (local, domain, Active Directory) ever changed once an account is created? If yes, under what conditions.

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marc_s On BEST ANSWER

Yes it can change when you migrate an account to a new domain.

That's what the SidHistory attribute in your AD account is for - you can look up all previous SIDs for that account.

See http://msdn.microsoft.com/en-us/library/ms679833%28VS.85%29.aspx for more details on the SidHistory attribute in AD.