Additional info on the bug. 1) when I get new mail in the !bulk folder (e.g. from the bugs.d.o confirmation about this bug), while viewing INBOX, i see the !bulk counter increase from 15 to 16 2) when I then select !bulk the counter goes to 1 (correct), and I see 4 msgs there, 3 old and the 1 new. The counter gets correctly updated both on the folders pane and in the system tray 3) when I view the new msg in !bulk, the counter goes down to 0 4) I then again select INBOX, or I can stay with !bulk selected 5) on the next periodical check of my IMAP account, it goes back up to 15 (when I select the !bulk folder again, there is nothing new there). At this moment the counter stays wrong until new mail arrives in the folder.
Vassilii