Install Thunderbird 5 Beta in Ubuntu 10.04/10.10/11.04 from PPA

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http://ubuntuguide.net – Thunderbird 5.0 beta was released few days ago, and it has the following changes: New Addons Manager and extension management API (user interface will be changed before final release) Tabs can now be reordered and dragged to different windows Revised account creation wizard, offering improved set-up Attachment sizes now displayed along with attachments New troubleshooting information page to aid supporting and diagnosing problems in Thunderbird Plugins can now be loaded in RSS feeds by default Various other user interface fixes and improvements Support for Mac 32/64 bit Universal builds (Thun (HowTos)