Avast 5 - Thunderbird: Server is not an IMAP4 server

Fresh install of Thunderbird and Avast 5. Thunderbird is unable to connect to your mail server via IMAP. You receive the error message:

<servername> is not an IMAP4 server.

With the release of Avast 5, there are new heuristic methods used for allowing imap and pop connections to mail servers. Avast is supposed to automatically prompt you for an action to take, but this sometimes gets messed up.

Solution:
1) Launch Avast user interface
2) Click Real Time Shields
3) Click Mail Shield
4) Click Expert Settings
5) Click SSL Accounts
6) Manually add your IMAP mail server account information - if it is already listed, delete it and manually add it. Be sure you know what you're doing here. If you're unsure, contact your email provider for help
7) Check your mail. If you're still seeing the IMAP4 error, try closing and restarting Thunderbird.

This solution works for both Thunderbird 2.x and 3.x