I'm using Thunderbird (latest) with Courier 0.44.0 (on Solaris 9) to access my email via IMAP/SSL. I know that there is a very limited built-in functionality for having the server notify clients of updates to folders and sub-folders... and that a kernel extension to support this does exist for Linux. But regardless of whether this is implemented as a server push or a client pull, my increasing number of folders to which mail automatically routes is causing this apparent inability to be quite annoying.

So, my question to the list is: Is there a way to get Thunderbird to periodically poll not just for new messages in Inbox, but all (or some specified list of) other (sub)folders? Short of that, has anyone been successful in getting this sort of server-based notification of folder updates working on Solaris? And, if so, what clients is this sort of notification known to work with?

Many thanks.