A new migration assistant will show up, allowing you to customize the transition and to keep some of your old configurations.When updating from 2.0 or an older version: Any userChrome.css entries you have defined for Thunderbird 2.0 may no longer work with the new version.

Many themes and extensions will not work (yet), thus verify that they have been updated for Thunderbird 3.0.

A 'classic' theme is available using the old icons.

Substantial redesign of theme items has been performed.

All descriptions refer to the default theme, thus items may be missing or appear differently if you use another theme.

Unless explicitly stated, the contents of this article apply to all major platforms (Windows, Max OSX, Linux).

Some but not all of these items also apply to SeaMonkey 2.0. If you are having problems after upgrading or with a new installation, look into Thunderbird 3.0 installation issues first for a more concise description. Note that the individual KB articles yet have to be updated, which may take a while. However, for those interested, links to relevant bug reports, wikipages, or forum threads are provided. This article describes noticeable changes in Thunderbird 3.0 from the user's perspective, thus won't address all the technical details and bug fixes which were done behind the user interface.

Changes after Thunderbird 5.0 which obsolete anything here should go into Thunderbird 6.0, etc.Ī lot of changes in backend code and features have been performed since the release of Thunderbird 2.0 in April 2007.

This article is still valid for both 3.1 and 5.0 unless obsoleted in those articles.

Thunderbird 3.1 was released on June 24, 2010.

Thunderbird 3.0 was released on Decemand is no longer supported.

Thunderbird 5.0 has been released on June 28, 2011.

Thunder bird new