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With an email client to receive and send email on your computer or mobile. Unlike a web mail program to be e-mails locally stored on the hard drive, and you can also email typing without an internet connection, and then send. FossaMail is a free desktop email client for Windows.

FossaMail is an open source desktop email client based on Thunderbird. In July 2012, Mozilla, the organisation behind that email client, announced Thunderbird is not active to develop. Or will there be regular bug updates. One of the disadvantages of this is, for example, that there was never a 64-bit Windows version of Thunderbird is released.

FossaMail is offered by the developers of the Palemoon browser that Firefox is based on. What look and feel is concerned, there are very little differences between Mozilla Thunderbird and FossaMail, but the latter is, for example, a 64-bit Windows version appeared. It is suitable for all Windows operating systems starting with Windows Vista.

The calendar add-on Lightning works also in FossaMail. Adds a calendar and appointments function as you know it from Microsoft Outlook.

FossaMail has the following characteristics:

  • free email client for desktops,
  • open source license,
  • based on Mozilla Thunderbird,
  • actively developed by the makers of the Palemoon browser,
  • available for all Windows systems from Vista.

FossaMail screenshots


You can free download FossaMail and safe install the latest trial or new full version for Windows 10 (x32, 64 bit, 86) from the official site.

Devices: Desktop PC, Laptop (ASUS, HP, DELL, Acer, Lenovo, MSI), Ultrabook

OS: Professional, Enterprise, Education, Home Edition, versions: 1507, 1511, 1607, 1703, 1709, 1803, 1809 - Overview features and capabilities software, apps for Windows 10
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