I should add, that if it's simple stuff (like AvScheduler, etc), you can just run it in an XP Virtual Machine on the 7 box.
If you move up to Flex, the whole system runs on 7 (or XP, although I don't know why anyone would do that unless they had old sound cards to reuse).
I built a box called 'Legacy'... It has all my old Digigram cards. It is the ONLY XP box in my entire AV Network.