It uses its own profile folder (default location to “%APPDATA%FossaMail”) and therefore has no interaction with any current installation of Mozilla Thunderbird. Please note that Windows XP is not supported and you need at least Windows Vista (or a newer edition of Windows), a CPU (processor) with SSE2 support (most modern CPUs support this, check this section – “CPUs supporting SSE2”) and obviously, enough space on your computer hard drive to store your e-mails along with an Internet connection.
Is built from source with compiler optimizations geared towards an as stable and smooth operation of the client as possible (Pale Moon-alike optimizations).
Uses the Pale Moon browser core as its back-end. The client is therefore based on Pale Moon rather than other Mozilla-derived mail clients.
Uses its own profile folder on your system. This means it will not interfere with existing Thunderbird installations.
The default profile location is %APPDATA%FossaMail
Should be compatible with all Thunderbird (v24/25b era) add-ons and plugins.
Is available in 32-bit (x86) and 64-bit (x64) versions for both Windows and Linux.
Comes with an optional calendar/organizer add-on (Lightning, available from the download location below) that will allow it to be used in a Microsoft Outlook style information manager fashion.
This is a maintenance release, updating the client’s back-end to Pale Moon 25.7.2.
Additionally, this removes telemetry from the front-end, and fixes issues with resuming from stand-by.