Mozilla has released the first Beta for the upcoming (August 16th) Thunderbird 6.0 on the Communications Beta Channel. For those who were running Thunderbird 5.0 Beta, you will be offered an update to the 6.0 Beta version. Otherwise you can get it here. What’s New in Thunderbird Beta The latest version of Thunderbird Beta has the following changes: Support for Windows 7 Jump lists Several fixes when importing email from Microsoft Outlook Default mail client check now works with newer Linux distributions Various other user interface fixes and improvements and numerous other bug fixes