The Windows Mobile Devices task reports the error: "ClassFactory cannot supply requested class"
This can occur when the Windows Mobile Devices task is run against an Exchange 2003 Front End server. The Front End server does not host mailboxes and ActiveSync devices.
If you are running a Windows Mobile Default Gathering and it is run against an Organization that contains Exchange 2003 Front End and Back End servers, this error can be ignored if the error relates to the Windows Mobile Devices task when it is run against a Front End server.
If you are running the Windows Mobile Devices task against individual servers, ensure the server is not a Front End server.