Active Directory Scalability – Maximum Limits

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:

 

Active Directory Scalability – Maximum Limits

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: