Any reason not to use QTP 11? We upgraded from QC 9.2 to QC 10 at one client site I worked at. QTP was upgraded to 11.0 and worked fine with the older version of QC and the existing licenses. The 9.2 tests which were built on XP and IE6/7 worked pretty much without change on Win7, IE8 and using QTP 11/QC 10. I think the only changes I made were to some object properies for recognising a couple dialog boxes.