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These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
Switch to TB2 thread icons, instead of TB1.5 set.
Remove some unused icons, switch to more consistent plugin icons.
Add Italian localization, German and French descriptions.
Added missing icons for conversation button, loading, use better pin icon for qfb.
Fixed chat window and folderpane toolbar.
Improve support for lwthemes.
Stop disabling the folder pane header, as it is now disabled by default.
Updated menu styles and fixed viewPicker, folderLocation, addresswidget popups.
Enabled image zooming in messages.
Fixed rss icon display.
Improved attachment formatting.
Add missing login dialog box for calendars.
Many css updates for better compatibility with TB38 - TB52.
Added Lightning calendar support, based on 2.6 non-aero appearance.
Removed blue backgrounds from several dialogs (compose windows, address book sidebar, quick filter bar).
Fixed home screen spacing, and added new icons.
Various other small bugfixes, including borders and close icons.
Removed transparency from the menu bar for better Windows Aero compatibility.
Added the missing chat icons and attachment services.
Fixed issues with tabs in titlebar, tab spacing, and window borders. Made selected messages more visible, and added support for the chat window and app menu.
Thanks to Michal Stanke, whose xpDefault theme was the source for the chat css.