Active Directory limits

nice blog..

- maximum number of GPOs that can apply to a user/computer: 999
- maximum number of DNS servers in an AD-integrated zone (without manually adding the details): 850 (Windows 2000), 1300 (Windows 2003)
- maximum number of supported DCs in a given domain: 1200
- maximum number of members of a group: 5000 (Windows 2000), unlimited in Windows 2003
- maximum number of DHCP servers in a forest: 850 (Windows 2000 SP1 or RTM), unlimited (Windows 2000 SP2 or later and Windows 2003)
- maximum number of UPN suffixes that can be set through the UI: 850 (you can set more if you need to via ADSI scripts)
- maximum number of objects that can be created over the lifetime of a given DIT (i.e. the AD database on a given DC): 2 billion

http://blogs.technet.com/mcs-ireland-infrastructure/archive/2006/10/14/active-directory-limits.aspx

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