Consider the following scenario. You try to deploy Windows Vista by using Windows Deployment Services (WDS) in an Active Domain environment. You have configured the new client naming policy for WDS. To make every client name unique, the automatic naming options apply an increasing number in every new client name. For example, you use %[0][n]# as the expression for the new client naming policy.

In this scenario, WDS cannot generate more than 255 client names. Therefore, you cannot add more than 255 machine account objects (MAO) into the domain. Users can install Windows Vista on more than 255 client computers. However, only the first 255 computers are automatically joined to the domain. Therefore, you cannot centrally manage the Windows Vista deployment for other computers.