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Download Thunderbird 9.0 Beta 1

Thunderbird 9.0 Beta 1

By Mozilla Organization  (Open Source)
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* Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Thunderbird
* Better keyboard handling for attachments
* Windows users can hide the menu bar (and show it with the "alt" key)
* Several user interface fixes and improvements
* and numerous other platform fixes

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