ImportExportTools NG
Above AddOn does not work with Thunderbird 91.0.3? Is there a bug?
Chosen solution
They are making good progress for version 91. Betas available at https://github.com/thundernest/import-export-tools-ng/issues/264
Download the zip file, change the file extension to XPI, and use tools > add-ons > install from file
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The add-on author still needs to update it to be compatible with TB91.
Well tks for news. Disturbing that TB gives information in addon-selection "compatible with all releases..."
Modified by HRL-HP
The latest add-on version currently available on AMO is compatible up to TB78.* https://addons.thunderbird.net/en-US/thunderbird/addon/importexporttools-ng/
If you want to backup your emails, use the free application Mailstore till import export tools by is updated for use in TB91.
Tks a lot to Lampros, that helps inbetween.... Regards Horst
Chosen Solution
They are making good progress for version 91. Betas available at https://github.com/thundernest/import-export-tools-ng/issues/264
Download the zip file, change the file extension to XPI, and use tools > add-ons > install from file