[Dovecot] False "new mail" warning from Thunderbird, using RC23

[Stephen Warren]

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I am continually getting false "New Mail" warning from Thunderbird.

I'm running Thunderbird 1.5.0.9 on Windows, and it's talking to two
different Dovecot 1.0.RC23 servers (one home server, one work server).
This was happening in older Dovecot versions too, so it's not new in RC23.

Very often, Thunderbird will pop up the "new mail" notification window,
and put a "new mail" icon in the Windows icon bar. However, when I view
the main Thunderbird window, there will be no folders with new mail.
Simply changing the currently selected folder in Thunderbird will clear
the tray icon. Sometimes the notification window will say something
small like "7 new messages", but right now, it's showing huge numbers
like "587 new messages", which could be the total message count in one
of my folders... Sometimes restarting Thunderbird will stop this
happening for a short while.

Is this a Thunderbird bug? Am I the only one seeing this? Does it have
to do with having two separate IMAP servers configured? Perhaps it's
because Thunderbird is configured to cache 5 connections to the server
(although I think that's the default?) Should I delete all my accounts
in Thunderbird, delete the (Thunderbird) cache files etc. on disk, and
re-create it all? I do notice that whenever Thunderbird starts, it
displays a whole load of folders that don't exist (e.g. got
renamed/deleted) and/or multiple copies (e.g. Sent, Sent-1, Sent-2),
which disappear very quickly. Is this related?
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