dovecot - Feb 2007 - False "new mail" warning from Thunderbird, using RC23

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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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> 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?
There are some long-standing bugs with Thunderbird for new mail 
notifications - seem to be mostly imap related. I've been seeing this 
for so long with Thunderbird that I just got used to it...

It happened when we were using courier-imap as well, and behavior seems 
to be about the same with Dovecot...

googling to see if these have been fixed (seems to be some promise that 
they will finally be fixed in 2.0 series), I stumbled on this extension 
someone else (not the extension dev) said fixed the problem for him, so 
I'm gonna try it:

Mailbox Alert Extension
https://addons.mozilla.org/thunderbird/2610/

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Best regards,

Charles