01-25-2010 02:21 AM
Only ACT! 2010 is officially supported... it's also faster and better than ACT! 2008, so would be worth the upgrade for other reasons.
ACT! 2008 may run, but if you have problems, it likely no-one will be able to resolve them.
One thing we know, you MUST have MS Office installed first... MS removed some items from Win7 that versions prior to ACT! 2010 needed