Migrate from SBS 2011 to 2008 Standard

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http://serverfault.com – I have a customer who is running a Windows Domain with a Windows Small Business Server 2011. Now I want to "update" (or downgrade?) to a 2008 R2 Domain. For two reasons. The customer has nearly reached the SBS user limit The customer now has a XEN-Server for virtualisation and I want to seperate the services (Exchange, WSUS, Active-Directory) to different virtual machines. Is there a recommended migration path? Is this even possible? (HowTos)