Windows 7 will not accept domain user accounts ending with the dollar $ sign



Why?

Starting in Windows 7 and Server 2008R2, domain user accounts should not end with the dollar $ sign.

Managed service accounts are identified by ending in a dollar sign ($). In some situations, the system may think you are entering a managed service account, when you are attempting to add a standard user account.

A Quick Tip from: KB2666116.