When installing PST Enterprise in an Active Directory (AD) infrastructure which has more than one domain, you may want to create the PST Enterprise service account and the PSTEnterpriseUsers security group in a different domain than that of the PST Enterprise server. The PST Enterprise installer can only create the security group and service account in the domain in which the PST Enterprise server resides. To create these objects in another domain, you must manually create these from AD. You can then choose the existing service account or existing users group options on the installer to select the manually created objects.