Subject: "Mailbox format invalidated..."

From: [email-masked] (Uncle Bob)
Date: 31 Jan 1996 18:55:54 GMT

I'm getting the message, "Mailbox format invalidated - Consult 
expert" when closing a folder and going to another one. Is this related 
to some of my outgoing mail not being stored in the 'sent-mail' folder? 
Could anyone shed any light on these two issues? They don't always occur 
at the same time.

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        Uncle [email-masked]