Change user role for builtin account Administrator

Hi,

Im migrating a SBS 2003 to a SBS 2011 and come to the step to "Move user accounts and groups for Windows SBS 2011 Standard migration" acc.to (http://technet.microsoft.com/sv-se/library/gg563796.aspx)

But the builtin SBS 2003 account "Administrator" doesn't show up in the "Change user role for user account" wizard, which means that I can see Administrator in Windows Small Business Server 2011 Console / Users and Groups, but it's role is "This user role no longer exists".

Does anyone know if there is a workaround for this?

MWebjorn