Thunderbird icon like this which indicate a unread email, keeps on displaying emails as unread even when the new mails have been read and are no longer 'unread'. Any known issues?
closed as off topic by jrg♦, htorque, Marco Ceppi♦ Jan 10 '12 at 16:16
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There is already a bug report in Launchpad with Thunderbird indicator and icon messages count and you can take a look at it here.