I have just installed Oneiric, and thunderbird comes preinstalled.
Everything works perfectly, except that when I alt tab to change windows between main thunderbird window and an email in writing progress, the thunderbird icons are the same.This is surprisingly essential, as I work with a lot of windows, and being able to know if i am on the email window i write, or i am on the main thunderbird window, is important to me.
I noticed that on windows environment, the icons are different: one with classical thunderbird icon, the other one with a letter icon.
I also did an install on Mandriva Linux release 2010.2 from mozilla web site, and ran latest upgrade of thunderbird... same problem.

Please could someone tell me how to put this right.
Many thanks