I searched TechNet en the exchange sites: nowhere to be found: the description en uses for the cmdlet "repair-migration"
It looks huge with loads of parameters.
like this one : would this rollback the previous migration of a user: ?
Repair-Migration -Revert -UserId <MigrationUserIdParameter> [-Force] [-Organization <OrganizationIdParameter>] [-Partition <MailboxIdParameter>] [<CommonParameters>]
A bit more explanation would be appreciated...