I’m using Outlook 2000 on a Win7 machine, and it works with a few minor cramps. I do recall during the installation there was a choice that went by in a dialog box that was easy to miss. The thing ran poorly. I did a re-install and noticed the box the second time — something like “install backwards compatible” or something like the spirit of that. Ran fine after that. -—for what that may be worth.
bkmk