WinPE or WinRE Not Necessary
The Windows Pre-Execution Environment (WinPE) is used to initially install Windows Server 2008 on a new computer. The Windows Recovery Environment (WinRE) is used to recover Windows Server 2008 if it cannot boot.
When you prepare the destination computer for U-Move, it is not necessary to boot using WinPE or WinRE.
U-Move can load Active Directory while Windows is running. On Windows Server 2003, U-Move will automatically boot into Directory Services Restore Mode (DSRM) if required.
|U-Move for Active Directory|