Inbox Has Decompression Bomb. What to do?

[Nattechy]

Hello all! I recently formatted my hard drive. I backed up my data, emails, etc. (I use Thunderbird) and installed the latest version of Avast! on my fresh WinXP install.

For kicks I decided it would be a good idea to have avast run a virus  scan on all my backed up data just in case. It turned up a "decompression bomb" in my email programs inbox. The thing is the inbox is one whole file (or looks to be anyway), inbox.msf. I am afraid to open it.

How can I delete the offending email without deleting my entire inbox (I have hundreds of emails that I need to keep)? The file avast has found is called "partno_0#2958668151". I've ran a search in Thunderbird for an email with this header, subject and have found nothing. Any help would be greatly appreciated. Thank you!

[DavidR]

Do nothing.
- Decompression Bomb, a file that is highly compressed, which could be very large when decompressed. This used to be a tactic long ago to swamp the system, also see http://forum.avast.com/index.php?topic=15389.msg131213#msg131213.
 
The name really is the most dangerous thing about this and I wish they would change it or simply not report it, a real PITA.

[Hermite15]

Inbox Has Decompression Bomb. What to do?

>>> run  
OK seriously it would be about time that Avast calls that something else This would avoid this same question to be asked again and again
what about "lethal file/archive"