Subject: I would suggest to open up a PMR asking to subscribe to SPR# SAZR8X5RLA to increase the weight of the issue
Content from PMR 1608497 : Migrations error using DUS or nupgrade with Exchange 2010
This issue has been reported to Quality Engineering as SPR# SAZR8X5RLA and was determined to be a software limitation. The following is the official support statement:
The current version of the DUS tool was certified against Exchange 2003 and supports Exchange 2007. IBM has not tested DUS against an Exchange 2010 server and there are no plans to provide this support in the near future.