It’s been a little while since the release of Thunderbird beta 2 and today we’re automatically offering the upgrade to all our existing alpha and beta users.
Upgrading from Previous Development Releases
At 12:00pm today (12:00 PDT) updates will start to be picked up by Thunderbird Alpha and Beta users. In the following 24 – 48 hours you should be offered the update if you’re running a previous development release.
Alternatively, you can pick it quicker by going to the menu, selecting Help and then “Check for updates…”