PFDAVADMIN error : name cannot begin with the ‘0’ character

Microsoft recommends using the PFDAVADMIN utility from a workstation, not from the console of the Exchange server, though. If you get this message, do NOT install the v1.1 Framework on an existing Exchange 2007 server. You run the risk of resetting some of the v2.0 Framework settings and, thus, breaking Exchange Server 2007! If you want to run PFDAVADMIN from the console of an Exchange 2007 server, you need to install the v1.1 .NET Framework prior to building Exchange. Thus, the “workstation” option is much more desirable.