The Windows Active Directory does not really have hard limits when it comes to group memberships. There are however soft limits.

Any ADSI or WMI query to a list of your group memberships will turn out to 1000 members in Windows 2000 mode, or 1500 in Windows 2003 native mode. Only by using ADO range limits, you can go by this soft limit.

This shouldn’t pose a problem when you are just adding members to an already big group. However, it does. … →