Current clients of the network include Windows XP Pro and Windows 7 clients. There are three Windows 2003 SP2 Enterprise domain controllers. I need to move to a Windows 2008 AD environment.
1) Is it very difficult to do an in-place upgrade of a Windows 2003 Server domain controller to Windows 2008 SP2 domain controller? Will the forest and domain need any sort of prepping? Can I have two Windows 2008 DCs and one Windows 2003 DC coexist?
2) Windows XP and Windows 7 clients shouldn't have any problems working in Windows 2008 AD right?
3) What are the advantages/disadvantages between Windows 2008 SP2 and Windows 2008 R2 64-bit? Will I lose out on anything crucial if I just stayed with Windows 2008 SP2?