As of yesterday 3/1/2015 T'bird stopped reading mail rationally on ONE of my two Windows 7 PC's and when aksed to check for new email retrieves the SAME message

no matter how many times I ask T'bird to check for new mail I get back ANOTHER copy of the same message dated 7:28am and NO MAIL received after that reaches my INBOX. On my other PC running Windows 7 only ONE copy of the 7:28am transmission arrives as does all subsequent email sent to me at this address... both PC's are protected by Avast anti-virus software. Turning the rogue PC off and on did not help nor did uploading and installing an updated version of T'bird.

Are the setup the same? same accounts, same folders, same messages, same filters same add-ons?
If that the case make a copy of the good profile and replace the bad one with that.

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