So how many PC can add user who is in server operator group to domain And how many can add administrator?

Hello, for the Domain admins there is no limit. For Server Operators group, AFAIK there is no limit also. For normal users, by default, it is 10. This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner 2010 / 2011 Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows 7, Configuring Microsoft Certified IT Professional: Enterprise Administrator Microsoft Certified IT Professional: Server Administrator

Thank's Mr.X And have i nice day ,you really help me

In addition to Mr X you should see this asricle which clearly mentions http://support.microsoft.com/kb/243327 So how many PC can add user who is in server operator group to domain Note that users in the Administrators or Domain Administrators groups, and those users who have delegated permissions on containers in Active Directory to create and delete computer accounts, are not restricted by this limitation. And how many can add administrator? The number of workstations currently owned by a user is calculated by looking at the ms-DS-CreatorSID attribute of machine accounts. http://www.virmansec.com/blogs/skhairuddin