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Could you please number the maximum amount of users for 2003 Active Directory?

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up vote 3 down vote accepted

About a billion RIDs per domain - thus, about a billion users can be created.

Note that deleting users doesn't make additional space; this limit is for the number of objects that exist or ever existed in the domain.

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Keep in mind this limit refers to objects, not just users, and that users are not the only things to create accounts in AD. Each computer that joins the domain is one less user that can be created, for example, as each computer creates an account for itself. – RobM Feb 24 '13 at 9:17

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