Rated 3 out of 5 stars
It's been some time now that the icons and the information shown on hover does not refresh. It displays the same mail agent info for all messages as the first message you select once thunderbird starts.
I'm on Win7 x64 and using other addons that mess with the message headers like the Display Mail Route, the Display Contact Photo and the Header Tools Lite. Don't know whether it some incompatibility with these or the fact that I'm using latest nightlies of thunderbird.