I downloaded Office 2010 Beta when it came out. I am now getting popups that I need to activate by tomorrow or it will be disabled. I don't remember ever getting any type of product key. What can I do to keep using Office 2010?
Same position here. You would have seen the product key on a web page after logging in to windows live (or whatever it's called), and before the actual download page. The page was mostly installation instructions with a product key at the top.
If you didn't bookmark, screenshot or copy it then you are almost certainly out of luck in a few days. Sorry.