Info:
http://en-us.www.mozilla.com/en-US/thunderbird/2.0.0.0/releasenotes/
* Message Tags: Create your own tags for organizing email.
Messages can be assigned any number of tags. Tags can be combined with
saved searches and mail views to make it easier to organize email.
* Visual Theme: Thunderbird 2's theme and user interface have been
updated to improve usability and maximize screen real estate.
* Session History Navigation: Back and Forward buttons allow
navigation through message history.
* Advanced Folder Views: Customize the folder pane to show
favorite, unread or recent folders.
* Easy Access to Popular Web Mail Services: Gmail and .Mac users
can access their accounts in Thunderbird by simply providing their user
names and passwords.
* Improved Support For Extensions: Extensions can now add custom
columns to the message list pane in addition to storing custom message
data in the mail database.
* Improved New Mail Notification Alerts: New mail alerts include
information such as the subject, sender and message preview text.
* Folder Summary Popups: Mouse over a folder with new messages to
see a summary of the new messages in that folder.
* Saved Search Folder Performance: Search results for saved search
folders are now cached, improving folder loading performance.
* Find As You Type: Finds and highlights message text as you type.
* Improved Filing Tools: Recent folder menu items for moving and
copying messages to recently used folders. Move / Copy again functionality.
* Updates to the Extension System: The extension system has been
updated to provide enhanced security and to allow for easier
localization of extensions.
* New Windows installer: Based on Nullsoft Scriptable Install
System, the new Windows installer resolves many long-standing issues.
* Windows Vista Support: Many enhancements and fixes for Windows Vista.
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