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Thunderbird has reportedly added experimental Exchange support in 140. Though I haven't figured out how to enable and test it :)

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The support is only for the EWS protocol (MS Graph will probably come next year). You can enable it in beta by going to Config Editor (this is primarily for advanced users), searching for the preference "experimental.mail.ews.enabled" and setting it to true.

You would have to manually add the account. Currently only mail is supported. No calendar support.

See https://blog.thunderbird.net/2025/07/thunderbird-monthly-dev...

Thunderbird users who need full Exchange support today, including mail, are encouraged to try the Owl addon. I used it a few years ago, very happy with it. I think it costs between $10 and $20, not a big expense for business software.

It was postponed. The release page is wrong :)

Probably Thunderbird tries it again with 141.

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