Maximum number of users:

So far, testing in this area has yet to reveal any new recommended limits to the number of members in a group or any other linked multivalued attribute. Production environments have been reported to exceed 4 million members, and Microsoft scalability testing reached 500 million members.

 

http://technet.microsoft.com/en-us/library/cc756101(WS.10).aspx

Above link explains these useful details:

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