A new version of the popular email client Thunderbird is available on the public Mozilla ftp site. No announcement yet on the official Thunderbird website and the update function from within Thunderbird is also not picking up this new version yet. The version on the official Mozilla Thunderbird website still lists version 2.0.0.6.
The Rumbling Edge lists 39 improvements over version 2.0.0.8 which is also only available on the ftp site at the moment. Nine improvements have the critical status which means the upgrade should be performed as soon as possible. There is no word yet as well if this is the release version or yet another release candidate version for testers only.
It seems to work fine and I was not able to spot any problems thus far using it.

Below is the list of changes so far:
Security issue: (2)
* Fixed: 307788 – if Kerberos tickets don’t exist when launching T-Bird, get Krb Ticket Manager to prompt for them
* Fixed: 380744 – Thunderbird reports “unable to decrypt” on truncated decryptable messages
Topcrash: (1)
* Fixed: 316543 – crash when opening message compose window
Crash: (3)
* Fixed: 351783 – Thunderbird crash on sending a return receipt
* Fixed: 374240 – Thunderbird crash on exit
* Fixed: 382480 – TB Crash [@ nsBidiPresUtils::ProcessText]
Attachment-related: (1)
* Fixed: 396377 – vCard sometimes cause heuristic scanners to generate a false positive
Build configuration: (5)
* Fixed: 381247 – Speed up mkdepend on Windows + VMWare
* Fixed: 385017 – Interoperability with beagle & kerry broken in tb 2.0
* Fixed: 385095 – Account Wizard won’t offer to create new RSS accounts
* Fixed: 387367 – mozilla-js.pc.in missing -DJS_THREADSAFE
* Fixed: 399207 – Add Hebrew to Thunderbird 2.0.0.8 for Windows and Linux
Functionality: (2)
* Fixed: 279018 – messages not automatically moved to Junk folder when manually marked as Junk
* Fixed: 389920 – Segmentation fault sending mail
Installer: (3)
* Fixed: 389244 – Uninstall information of old version not cleared from registry when updating via auto update
* Fixed: 390214 – avoid the second UAC prompt for helper.exe on software update by launching it directly from the elevated updater.exe process
* Fixed: 393149 – Some registry keys aren’t removed under HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\
Networking: (1)
* Fixed: 391556 – problems handling namespace that starts with hierarchy delimiter
Printing: (1)
* Fixed: 275312 – Print engine allows JavaScript execution
UI improvements: (7)
* Fixed: 219662 – “OK” button doesn’t activate in “Link Properties” dialog
* Fixed: 277905 – IMAP Message UID Greater 2099999999 not displayed
* Fixed: 320102 – File – Save As – Template menu item does nothing for an existing message in Local folders
* Fixed: 320739 – plain text email containing link with numerical IP should not be marked as scam
* Fixed: 351692 – Need to see Account Names in the Move To / Copy To Recent Folder menus
* Fixed: 381364 – locationFolders menulist icon lacks horizontal margin
* Fixed: 386855 – attachment file name stripped of consecutive spaces
XUL Toolkit: (1)
* Fixed: 386874 – add a python emulation for nsinstall for –disable-compile-environment
Miscellaneous fixes: (4)
* Fixed: 133016 – Freetext url recognition stops at “)” and “‘” (apostrophe)
* Fixed: 256510 – Return receipts don’t use Multiple identities
* Fixed: 388105 – RDFResource and RDFServiceImpl leak on startup test
* Fixed: 393196 – apply_rfc2047_encoding() erroneously inserts whitespace for addr-spec-only addresses
Mac-specific: (2)
* Fixed: 299368 – Hide ‘Print Preview’ menu item in Mac OS X
* Fixed: 379705 – Build movemail on Mac, just don’t put it in the new account wizard in Thunderbird
BeOS-specific: (3)
* Fixed: 389953 – BeOS should build components with -Bsymbolic
* Fixed: 394946 – BeOS Thunderbird builds fail in migration code
* Fixed: 397116 – Branch build fails due to missing BeOS libs
OpenBSD-specific: (1)
* Fixed: 236599 – openbsd configuration fixes for alpha, amd64, arm, i386, macppc and sparc64
OS/2-specific: (2)
* Fixed: 351167 – arrow does not change to finger over URL
* Fixed: 390485 – Fix updater build break with GCC 3.3.5

Thunderbird 2.0.0.12 has been released
Thunderbird 2.0.0.5 available