Although Mozilla announced last July that would slow their investment (time and resources) in the development of Mozilla Thunderbird, those responsible for this mail client have announced the availability of Thunderbird ESR 17 , sharing as in the case of that surname Firefox ESR (Extended Support Release) that qualifies as a client with extended support.
Except for this change, there are few changes in Thunderbird relevant, although we do have a new button in the upper right corner of the application (called Menu Button) to allows users to customize the interface user program.
also corrected some bugs 16.x branch of Thunderbird that caused some problems with the spelling or downloading mail through IMAP. As with Firefox 17 ESR version of Thunderbird does not support OS X 10.5 Leopard, and the developers have fixed 12 security vulnerabilities, five of which were critical as Mozilla.
As noted in The H Open have more information about Thunderbird ESR 17 in the list of corrections and in the release notes. Also you can download the email client from the official site of the project.
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