SBS 2011 Essentials client connector deploying problem - InvalidOwnerOfMachine

If you are migrating from SBS 2003 and you are migrating to SBS 2011 Essentials, when installing the client connector wizard on SBS 2011 Essentials you may hit an issue where the client connector log shows the following error:

[2108] 110913.145924.7363: ClientSetup: Entering JoinNetworkTask.Run
[2108] 110913.145924.7363: ClientSetup: Network Join Client to Server: ClientComputerName=LABDELLD610-2 ServerName=ALPHA
[2108] 110913.145924.7363: ClientSetup: Maximum amount of joined machines: 30
[2108] 110913.145924.7363: ClientSetup: Current amount of joined machines: 4
[2108] 110913.145924.7363: ClientSetup: Server already contains a computer joined with Client Machine Name
[2108] 110913.145924.7363: ClientSetup: Network Join has been forced
[2108] 110913.145924.7363: ClientSetup: Running Network Join
[2108] 110913.145924.7363: ClientSetup: Call MachineIdentity.GetCert
[2108] 110913.145928.1318: ClientSetup: JoinNetwork had errors: ErrorCatalog:InvalidOwnerOfMachine ErrorCode:-1
BaseException: Microsoft.WindowsServerSolutions.Devices.Identity.MachineIdentityException: MachineIdentityManager.GetCert
   at Microsoft.WindowsServerSolutions.Devices.Identity.MachineIdentityManager.GetCert(String serverName, String userName, String password, Boolean bForce)
   at Microsoft.WindowsServerSolutions.ClientSetup.ClientDeploy.JoinNetworkTask.Run(WizData data)
[2108] 110913.145928.1318: ClientSetup: Exiting JoinNetworkTask.Run
[2108] 110913.145928.1328: ClientSetup: Task with Id=ClientDeploy.JoinNetwork has TaskStatus=Failed
[2108] 110913.145928.1328: ClientSetup: Task with Id=ClientDeploy.JoinNetwork has RebootStatus=NoReboot
[2108] 110913.145928.1328: ClientSetup: Exting ConnectorWizardForm.RunTasks
[3560] 110913.145928.1396: ClientSetup: JoinNetwork Tasks returned TaskStatus=Failed

In order to install the connector, try using a domain administrator account to begin the client connector wizard or use the same user that first joined the computer to the domain, or set up a new local administrator account on the machine and then provide network AD credentials when prompted.

(see http://social.technet.microsoft.com/Forums/en-US/smallbusinessserver2011essentials/thread/d44b1dca-8327-4355-84c9-619f724e16cd and http://msmvps.com/blogs/bradley/archive/2012/02/12/sbs-2011-essentials-migration-invalidownerofmachine.aspx