The latest news from Mozilla Messaging is Thunderbird 3.1 is expected to ship mid to late June 2010. Thunderbird 3.0.5 is dependent on the release of Firefox 3.5.10 which seems to be stuck in a perpetual delay.

Mozilla has released the fifth Alpha for Gecko 1.9.3 layout engine likely to be used in the future Firefox 4. This release is being made available for testing purposes only, and is intended as a preview release for web application developers and the testing community. See Release Notes for more information and download/installation instructions. New changes in this release include: User-facing changes Aero Glass is now enabled for Windows Vista and Windows 7. More parts of the new Windows theme have landed including new main button icons. Many more changes are coming in later releases. The new Add-ons manager has…