Mozilla Thunderbird, Portable Edition 78.5.1 (email client) Released

John T. Haller's picture
Submitted by John T. Haller on December 12, 2020 - 9:15pm

Mozilla Thunderbird, Portable Edition 78.5.1 has been released. It's the popular Mozilla Thunderbird email client bundled with a launcher as a portable app. It's packaged in Format so it can easily integrate with the Platform. And it's open source and completely free.

Mozilla®, Thunderbird® and the Thunderbird logo are registered trademarks of the Mozilla Foundation and are used under license.

Update automatically or install from the portable app store in the Platform.


portablethunderbird_small.pngMozilla Thunderbird is the safe, fast email client that's easy to use. It has lots of great features including quick message search, customizable views, support for IMAP/POP, RSS support and more. It has built in OpenPGP support. Plus, the portable version leaves no personal information behind on the machine you run it on, so you can take your email and adress book with you wherever you go. Learn more about Mozilla Thunderbird... Installer / Format

Mozilla Thunderbird, Portable Edition is packaged in a Installer so it will automatically detect an existing installation when your drive is plugged in. It supports upgrades by installing right over an existing copy, preserving all your email and settings. And it's in Format, so it automatically works with the Platform including the Menu and Backup Utility.


Mozilla Thunderbird, Portable Edition is available for immediate download from the Mozilla Thunderbird, Portable Edition homepage. You can get the German release from the German homepage and other releases from the Localization page. Get it today!

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John T. Haller's picture

If you downloaded 78.5.1 prior to this announcement, please download it again. There was a build issue before release. The official 78.5.1 release has a PackageVersion of in appinfo.ini. The file version when you hover over the installer in Explorer is the same.

Sometimes, the impossible can become possible, if you're awesome!

John T. Haller's picture

They're working here without issue. Which language are you having issues with?

Sometimes, the impossible can become possible, if you're awesome!

All of them!
Don't work neither with Firefox nor Chrome (both latest versions).
Just tried and it did work with Opera.
Looks like a problem switching to Sourceforge when using Firefox/Chrome.

Update: just went directly to Sourceforge ( using Firefox and was able to download from there.

John T. Haller's picture

It's fine here in both Firefox and Chrome. Most likely your local SF mirror is having issues.

Sometimes, the impossible can become possible, if you're awesome!