tested with: thunderbird 68.6.0 (64-bit) on GNU Linux Debian 10

if one uses the build in calendar of thunderbird (it was called sunbird, was replaced by lightning)

go into advanced config editor: (about:config)

type:

calendar.alarms.showmissed

and double-click on the entry

to change it to false

https://github.com/Ericsson/exchangecalendar/issues/546

then simply close thunderbird and restart it

privacy?

About Your Rights

Mozilla Thunderbird is free and open source software, built by a community of thousands from all over the world.

There are a few things you should know:

• Thunderbird is made available to you under the terms of the Mozilla Public License.
  • This means you may use, copy and distribute Thunderbird to others.
  • You are also welcome to modify the source code of Thunderbird as you want to meet your needs.
  • The Mozilla Public License also gives you the right to distribute your modified versions.
  • You are not granted any trademark rights or licenses to the trademarks of the Mozilla Foundation or any party, including without limitation the Thunderbird name or logo.
  • Additional information on trademarks may be found here.
    Some features in Thunderbird, such as the Crash Reporter, give you the option to provide feedback to Mozilla.
  • By choosing to submit feedback, you give Mozilla permission to use the feedback to improve its products, to publish the feedback on its websites, and to distribute the feedback.
  • How we use your personal information and feedback submitted to Mozilla through Thunderbird is described in the Thunderbird Privacy Policy.
  • Some Thunderbird features make use of web-based information services, however, we cannot guarantee they are 100% accurate or error-free.
  • More details, including information on how to disable the features that use these services, can be found in the service terms.
  • In order to play back certain types of video content, Thunderbird downloads certain content decryption modules from third parties.

https://www.mozilla.org/en-US/privacy/thunderbird/

https://www.mozilla.org/en-US/privacy/

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