How to Clean Up Active Directory after an Unsuccessful Migration:
This article contains steps to clean up the Active Directory when a Small Business Server 2011 Standard migration installation fails. If the setup of SBS 2011 Standard fails and the installation must be performed again, it is advisable to perform a system state restore on the source server and then retry the migration install. Sometimes it is not possible to perform a system state restore. This article contains the steps to clean up active directory so that a second attempt at installation will be successful.
This article should be subtitled: “You didn’t listen to Susan after she REPEATEDLY said over and over again to make sure you have a system state backup BEFORE you start the migration from SBS 2003 to SBS 2011. And then your migration barfed and you were stuck”.
Next time, take a backup. This time, there’s your KB.