One solution would be to downgrade Thunderbird 1.5.0.8 to a prior version which should fix this immediately. A better solution would be to download a nightly build of thunderbird and use that. The bug was fixed and all coming nightly builds should contain the bug fix as well. This nightly build for example contains the fix.

Thunderbird 1.5.0.9 which will contain the fix will most likely be released sometime in December which means the only way to fix this bug now is to either downgrade or install a nightly build.

You will have to do the following no matter if you downgrade or install a nightly build:

• Backup your Thunderbird profile folder which is located C:\Documents and Settings\your username\Application Data\Thunderbird\Profiles\random.default
• Uninstall Thunderbird.
• Go to the Thunderbird profile folder and delete every msf file. Don’t worry,Thunderbird will rebuild them once you click on such a folder in Thunderbird.
• Install Thunderbird 1.5.0.7 or the nightly build

The missing mail should appear. Everything seems to have reverted back to normal for me using the above nightly build. Let me know if you encounter errors or if this method is not working for you.

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