Windows Small Business Server 2008 creates a group policy called "Windows SBS User Policy", one of the tasks of this group policy is to add a few shortcuts (OWA, RWW, and WSS) to IE on SBS clients. If this list is modified AND you attempt a SBS 2008 to SBS 2008 migration the migration will irrecoverably fail. You will receive this following installation issue and be unable to complete the migration: The installation of Windows Small Business Server 2008 cannot finish.
At this point, you must restore the original server from backup and completely start the migration process over. To avoid this issue please complete the following steps prior to a SBS 2008 to SBS 2008 migration[…]