IMAP Message count

[Karl Pearson <karlp ourldsfamily com>]

My email server doesn't count the unread messages correctly. Strange thing 
is that I had until recently, the same setup at work, and it does count 
right.

Using Squirrelmail as the client, I have show all unread email count 
turned on. The count slowly works its way up until it shows I have as many 
as 10,000 unread emails in my various and sundry email folders.

If I do a Search for something in all folders, the count is reset to 
something close to correct, though only if I mark all messages in every 
folder showing "N"ew as read.

Any ideas?

Dovecot is the IMAP server.

Karl