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thunderbird error

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thunderbird error

Using Thunderbird (latest version) (win7)  today started getting error "unable to write email to the mailbox.  Make sure the file system allows you write priviledges and you have enough disk space to copy the mailbox"  After having sent and received several messages today.  Have nothing in my inbox - all have been moved to other user folders.  Have unchecked use IPv6 in network settings.  Using mail.comcast.net and smtp.comcast.net for receive & send ip addresses. Tried several other things shown on this site but no difference.  Any clues as to how to fix this?