Exchange Server SID

Today I realized very strange smtg .Most of our user group configuration shows ,pls Pic. What that mean s-1-5-21xxxxx?
I hope every thing ok with user account? exchange group
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KaltiConnect With a Mentor Commented:

I'm sorry but I don't understand your question, could you please give more detail about your problem?

The number you showed in your image is a SID of a user which has most likely been deleted and therefore cannot be shown as a username anymore. But without more information it is hard to tell what you are after?

orkinosAuthor Commented:
is that possible to find out from these nummbers ,which user was there?
Neil RussellConnect With a Mentor Technical Development LeadCommented:
That will not help you. You ONLY See the SID ID when AD Can not find an active user in the directory anymore. The user it related to has left and been deleted. You have no user to reference to. Therefore it will ONLY show the SID that is left behind.

Dont forget ALL AD stores to link things together is the SID, not user names. When you see a user name normally, this has been resolved by AD doing a lookup of the SID and finding what the "PLAIN NAME" is that it can display to us mere humans.
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