TS3276 Mail has started sending duplicates of a message, especially group messages.  It also opens 2 windows for writing a new email.  Help.

Mail has started sending duplicates of a message, especially group messages.  It also opens 2 windows for writing a new email.  Help. How do I fix this?

Unfortunately there isn't official commercial support for Mozilla Thunderbird from Mozilla Corp.. I believe some contributors here ([http://mozilla.magicfab.ca myself included]) do offer such support, though.
''Before doing anything else, please do exit Thunderbird completely and [https://support.mozilla.org/en-US/kb/profiles-tb#w_backing-up-a-profile backup the profile folder] - it contains all your email, settings, filters, etc.''
Regarding your issue, it looks like the mail folder information may be corrupt. In the left pane, in the folder list, right-click on the Sent folder and select '''Properties'''. Choose "'''Rebuild Index'''" or "'''Repair Folder'''" - do you even have that option? Once done, exit TB completely and restart it.
Updating to a newer version will help anyone help you, if only because some of the documentation for older Thunderbird versions is a bit harder to find and testing to try & reproduce your problem will be harder. Don't do this just yet, though :)
After this issue has been addressed I would suggest considering using IMAP if your provider allows you to, and of course archiving your email to Local Folders and doing regular backups of your profile.
If you want to arrange commercial support, contact me via the link I provided above and we can discuss rapidly. Otherwise I am fine continuing here, however I can only reply as time permits. I am in Montreal (so, EST time zone).

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