Error in Mail Source Agent log similar to the below, & no mailboxes are migrated.
22/07/2009 8:54:11 PM CLicense::LicenseMailbox Error -2147024843 The network path was not found. File: RegKey.hpp Line: 124
The MSA needs to connect to the registry of the license server (the console machine by default) using its NetBIOS name, but is unable to do this.
Check that you can resolve the NetBIOS name of the console machine from the source Exchange server. Add correesponding entries to the HOSTS file if necessary.
If registry editor can successfully open the QMM console by hostname from the MSA server, in QMM interface Tools->Options verify that the license server name is set up correctly to the current QMM console machine.