I'm considering building a Windows Server 2008 R2 Domain with VMs for my home lab for my own education & exam preparation. I have a Windows 2008 R2 VM with SQL 2012 in Workgroup mode I've been using for about a year. Can I join this VM to a new domain and have full functionality with domain security & other SQL VMs or does SQL 2012 need to be installed AFTER the server joins a Domain?