I came across a scenario where I needed to migrate Windows
XP with Office 2003 installed to Windows 7 with Office 2010 along with the user
data and backup.
In my setup I used Microsoft Deployment Toolkit (MDT 2012)
on Windows 2008 R2 SP1. I used the default USMT migration process, it migrated
the Office components along with data and user outlook settings. But it didn’t
attach the pst which was saved in D drive rather than the default location.
Then I came across the USMT 4 update for Microsoft Office
2010. You can request and download the hotfix from HERE. The update includes
fixes and support for migration scenarios for when the source or destination
computer has Microsoft Office 2010 installed. 
