Unidentified SIDs in Windows/Exchange - Lookup/Remove?

Noticed a few rogue SIDs (S-_-_____--______)  in Exchange/Windows that I think may be for old accounts that were removed. How can I check to see if they are in use and if I can safely remove them?
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RTM2007Asked:
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Seth SimmonsSr. Systems AdministratorCommented:
if you see the SID, it means the account was deleted.  i just remove them when i find it since it doesn't match to any account
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Randy DownsOWNERCommented:
I would just leave them alone. Removing SIDs that you can't identify can break your system. Some of them may be related to Windows before it joined the domain.
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