Where do i find old KB articles for QTP?
Goto http://support.openview.hp.com/ and click on "Use self-solve knowledge search" and login with your HP Passport ID. If you don't have one, you will have to register for one.
Make sure your search screen looks like this: (i.e. you are looking for Technical Documents)
When I do this search and scroll down, I see 137 results, which may not be all, but is a start.