As we've recently covered, Mozilla has moved to an agressive rapid release cycle for its Firefox browser, with the latest version 4 quickly emerging as the most popular version of Firefox. At the same time, though, Mozilla is pursuing rapid release cycle for other projects, including its Thunderbird email engine. Thunderbird is now out in a new beta version 5.01, featuring a number of upgrades.
June 3, 2011
Mozilla Delivers New Beta of Thunderbird Email Client
Read more at Ostatic