<<Yes 6.0 and 7.0 work in Windows 2000>>
4.0 and 5.0 had NT/2000 versions as well. In fact, I would only reccommend using AOL under Win 2000, that way when AOL crashes it won't take the whole OS down, at least that has been my experience with AOL. (I still use it as a backup ISP.)
ZV