Thunderbird 78.11.0

[German]The developers of the Thunderbird email client have released Thunderbird 78.11.0 on June 1, 2021. It is a maintenance update for the 78 main version of the email client, which fixes various bugs.


I have already been pointed to this update by some blog readers. According to the release notes, several fixes and improvements have been made.  

  • OpenPGP could not be disabled for an account if a key was previously configured
  • Recipients were unable to decrypt some messages when the sender had changed the message encryption from OpenPGP to S/MIME
  • Contacts moved between CardDAV address books were not synced to the new server
  • CardDAV compatibility fixes for Google Contacts
  • Folder pane had no clear indication of focus on macOS
  • Windows theme improvements

According to this page, no security vulnerabilities are fixed. 

System requirements

The system requirements for the different operating system versions (see here for more details):

  • Windows: Windows 7, Windows Server 2008 R2 or higher
  • Mac: Mac OS X 10.9 or higher
  • Linux: GTK+ 3.4 or higher

The download is available here. By the way, Thunderbird is free of charge

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