
It has been specially designed for* : - Windows 10 (v1803) - MacOS 10.14.1 (Mojave) - Linux Ubuntu 18.04.1 LTS (Bionic Beaver). Thank you : : : : : : : : : : : : : : : : : : : "TT DeepDark" is a complete theme addon created to transform the look and feel of Thunderbird. Before installing the latest DeepDark version, please, READ CAREFULLY AND ENTIRELY ALL THE ADD-ON DESCRIPTION. Therefore, it also means that once you install it, it will be listed in the "Extensions" section of your Thunderbird add-on's manager page. This means that my add-on's latest version is now available under the "Extensions > Appearance and customization" category on Thunderbird add-ons website (so, NO MORE in the "Themes > Complete themes" category).

Thank you : : : : : : THUNDERBIRD 68 compatible version: A Thunderbird 68 compatible version is also available here > Please note that since it was not possible anymore to achieve a comparable level of customization through a theme add-on, under Thunderbird 68, I had to create a "regular" extension. The "add-on home page" link is located on this page next to this add-on description.

However unless separate icons are developed Vista will inherit all icons from the XP theme.: : : ! IMPORTANT ! : : : : : : About compatibility with the latest Thunderbird version As long as a compatible version with the latest Thunderbird is not yet available on Thunderbird add-ons website (this means at least until Thunderbird theming API won't allow "mailextensions" to customize more completely the UI), you can find a substitute, together with versions compatible with Waterfox "Classic" browser by visiting my add-on home page.

Once bug 468751 lands Vista will have a separate theme space to work with. What are the correct fonts to use for Windows XP?.What are the correct fonts to use for Windows Vista?.
