Here's a strange one. I have a user who's using Thunderbird 2.0.0 and assigning multiple tags (keywords) to emails, which are getting "lost" (I'll explain) when he leaves the folder and comes back. I can reproduce this on *his* account myself, but cannot reproduce it on *my* account (separate new TBird 2.0.0 profiles on Windows XP).
Use the two TBird default tags 'Important' and 'Work' for all these tests, which it refers to as $Label1 and $Label2 in IMAP-keywords land. If I go into my account, label an email with both tags, it sticks -- I can click on Drafts then back to Inbox, and both tags/keywords still show in the client.
If I go into his account, add the two tags, then click on Drafts and back on Inbox, only the *second* tag (Work, $Label2) shows. If I remove that tag, then the first tag (Important, $Label1) immediately pops up!
On the backend the actual Maildir files match the dovecot-keywords and have the correct letter appended in both cases - so, in his account when the email only shows one tag, the physical mail file has the letters for two tags. So Thunderbird should be showing both tags, like it does in my account where everything is working correctly.
This leads me to believe that the problem has something to do with the difference of dovecot-keywords content, and the interaction TBird has with Dovecot. My account, working correctly, looks like:
dovecot-keywords: 0 $Forwarded 1 $MDNSent 2 $Label2 3 $Label1
file: Maildir/cur/1178712608.H529732P11686.yak.fluid.com:2,RSdc
...which matches, d=$Label1 (Important), c=$Label2 (Work) and TBird is displaying the email as having both tags - all is well and good. Now, his account looks like:
dovecot-keywords: 0 Junk 1 NonJunk 2 $Label4 3 $Label1 4 $Label2 5 $Label3 6 $Label5
file: Maildir/cur/1178728930.P28392Q0M960111.yak.fluid.com:2,RSbde
...again, everything matches on the server; yet, it Thunderbird is only displaying $Label2 (d,3). I also noticed something interesting, even if I have the TB 'Junk Controls' completely disabled on his account, and remove all tags using the menu option, that file still retains the 'b' (NonJunk) tag in the filename:
Maildir/cur/1178728930.P28392Q0M960111.yak.fluid.com:2,RSb
All this long-winded explanation leads me to believe that somehow the difference in dovecot-keywords is causing this problem, but what I can't tell is who's problem it is -- Dovecot, or Thunderbird?
Thoughts welcome, -te
PS: all the normal things tried like deleting the dovecot index files, Thunderbird cache files and profiles, etc.
-- Troy Engel | Systems Engineer Fluid, Inc | http://www.fluid.com