Comment 29 for bug 571296

(In reply to comment #27)
> @Wayne
> I do not think that this is a minor bug. Because it is getting on my nervs to
> do at least tree clicks after starting Thunderbird to see, whether I have new
> Mail.

Marc, Minor does not mean that there is no pain. What it means is that there is a workaround such that the condition is avoidable. Please see https://bugzilla.mozilla.org/page.cgi?id=fields.html#importance

In this case, click in some other folder after empty and before shutdown. Or perhaps, shut down thunderbird less frequently.