Rated 5 out of 5 stars

If you update from TB3.X and already add "ileopard3.2.6" as an extension then: go to (or find) ...\extensions\iLeopardMail@reo-2007 then edit the "Install.rdf" with notepad ( as per bmdb) look for maxversion and change it to 7.0 /save and start TB5.
So far I only found cosmetic and display issues with the new TB5 "add-on manager" all prior forms including lighting/task seems ok.