Immediately skipping version 4 in favor of synchronization with Firefox, right from version 3.1.11, Thunderbird, one of the most popular cross-platform email clients and news feeds, has been updated to version 5.0.
You can also do testing of the latest and frequently updated builds of Thunderbird 6.0 (Aurora) and 7.0 (Shredder) in your own language. In the Miromar branch, there are still builds 5.0b2, after a while the version of the builds in all branches will be incremented. ')
Changes from version 3.1.11:
The account creation wizard has been redesigned to simplify and simplify e-mail setup;
a new page with information to solve problems;
A new add-on manager (similar to the one in Firefox 4 and 5);
tabs can now be reordered and dragged between different windows;
next to attachments their size is now displayed;
RSS feeds can now download plugins;
made several fixes to the theme for Windows Vista and Windows 7;
support for universal builds for Mac 32/64 bit (beta versions of Thunderbird no longer support PowerPC on Mac);
More than 390 fixes were added to the platform to improve speed, performance and stability.