User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1 Build ID: 20120905151427 Steps to reproduce: I got new mail and before opening/reading the mail I shutdown Thunderbird. Actual results: Thunderbird was shutdown, but the new mail icon(s) in the Win 7-taskbar are still visible afterwards. Expected results: I expected that the icons would disappear with the shutdown of TB. You can even repeat this by opening TB again, getting some new mail again and shutdown again. This way you can get 2 new mail icons in the taskbar (see attached file). They remain visible until you hover over the icons with the mouse pointer.

Do you have exetnsions installed in Thunderbird ?

I have these extensions: * German dictionary 2.0.2 * Lightning 1.73 * provider for Google agenda 0.17 * Startupmaster 1.3 * Test pilot 1.3.9 * Thunderbirthday 0.8.0 * United States English Spellchecker 6.0

does it wrk better if you restart Thunderbird with addons disabled (see help menu) ?

No, result is the same.