Mozilla Thunderbird: check all IMap folders

I use Mozilla Thunderbird to access my corporate email when I'm outside our firewall, through a secure IMap gateway, and inside the firewall when I'm working on my Linux systems. It's a very nice email app. The one thing that always catches me out is that, by default, Thunderbird will only check subscribed IMap folders for new mail. I have a bunch of rules that run on the Exchange server that sort my mail into folders, so checking the folders for new messages is important to me. Every time I re-install Thunderbird, I have to re-remember how to change the default behaviour, so I'm writing it down here for future reference!

First, get the advanced config window up from the Tools | Options... menu (Windows) or Edit | Preferences... (Linux). On the Advanced options tab, click the Advanced Configuration button to bring up the about:config window. Put folder into the filter box:

Double click the mail.check_all_imap_folders_for_new to set it to true. Done.

This works on Thunderbird 1.5.x. I don't know what will change when 2.0 comes out.

del.icio.us: thunderbird, imap, configuration.