Intella is not supported on Windows 2008 Server, nor do we have any plans in that direction. The problem is that this is really a server platform on which a lot of client applications will have a plethora of issues. The other issue is that by default, servers are optimized for background tasks and not applications such as Intella and other forensics software.
See e.g. this page to get an indication of what issues you could be facing: Windows Server 2008 R2
Intella is supported on 32 and 64 bit Windows XP, Vista and Windows 7.