Thunderbird .msf file problem


WA0ITP
 

I'm having trouble with Thunderbird.  See mssg below.  I get this message on every folder and have to go thru the routine of repairing the folder in order to see the messages in that folder.  Has anyone else experienced this weirdness?  If so did you find a fix? 
TIA for any info.

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72 WAØITP
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