I use Thunderbird to read mail from a number of IMAP servers (some gmail, some dovecot). I have many sub-folders into which mail is automatically sorted by the various IMAP servers. I generally have a number of tabs open in my Thunderbird windows. However, tabs which are for folders which are not the main INBOX for an account never show new messages which come in once the tab was opened. Even if I hit the "get new messages" button, the INBOXs update, but noting else does. The only way I can get the new messages is either to read an unread message in the folder in question, or to close and reopen the folder's tab. How do I get all of the tabs to automatically update with new messages just like the INBOX folder does?