Thunderbird adds native Microsoft Exchange email support

Posted by babolivier 11/19/2025

Thunderbird adds native Microsoft Exchange email support(blog.thunderbird.net)

463 points | 141 commentspage 2

tracker1 11/21/2025||

Lacking calendar and contacts sync are a critically missing feature here. I'm not sure what there is to like here above IMAP access.

Aside: Mozilla should really create a nice full-featured email server with the features found in Exchange/O365 for use with Thunderbird... it's a space that desperately needs competition and more solutions.

zipy124 11/19/2025||

Guess this means I can cancel all my OWL subscriptions.

TomasEkeli 11/19/2025|

I'll stick with Owl for a while longer. This native feature doesn't support calendars or address books, making it essentially worthless to me.

Also it's based on a protocol that's dying (slowly).

Good to see they're attending to exchange support, but this is a lackluster step.

nashashmi 11/19/2025||

I’d be more excited for thunderbird if it worked on an open source alternative to EXCHANGE SERVER. Firefox and thunderbird are clients. But it is time they launched servers as well. There might not be any advantage to another https server. But a new mail server with a new email client protocol would be exciting. And maybe a WebDAV server that Firefox could work with natively.

hshdhdhj4444 11/20/2025||

There are several open source mail server options available.

The only real new protocol is JMAP which is pretty good and I’d much rather more clients and servers support JMAP than create a new protocol altogether.

cookiengineer 11/20/2025||

I can recommend trying out Mox as an email server. The author built everything from scratch and does a lot of great work when it comes to unifying everything. The wizard spits out all the discovery, DKIM, DMARC, DANE and MTA STS related subdomains you have to change the entries of (that is the most painful part) but everything else really works like a charm.

Much much easier installation process than weeks of trying to make postfix and dovecot work.

[1] https://xmox.nl

[2] https://www.xmox.nl/protocols/

psittacus 11/20/2025||

Take a look at Open-Xchange, it's not developed by Thunderbird folks but otherwise fits the bill.

https://en.wikipedia.org/wiki/Open-Xchange

mailbox.org is based on it.

richx 11/19/2025||

I like Thunderbird, it’s a great tool for private use. One killer feature I always missed (not sure if it exists today by default in Thunderbird), is the great calendar integration of outlook. I use the calendar a lot, during work but also to organize our family. It’s super important for me to able to send invites to co workers and my wife :-)

Telemakhos 11/19/2025||

I've never seen a piece of software that managed to implement all of the iCalendar specification, which to me seemed like a data model for a good productivity app that's just never manifested. iCalendar (RFC 2445 from 1998) outlined not only events but todo and a journal component for memorializing meetings. Outlook seems to ignore VTODO entries in iCalendar completely, and VJOURNAL support is deprecated.

imp0cat 11/19/2025||

Since last year, TB has native caldav/carddav support.

tacker2000 11/19/2025||

Thanks!

I have a few Exchange inboxes and once MS forces the “New Outlook” design, without allowing the legacy option anymore, im gone!

XorNot 11/20/2025||

Interesting, but I wonder if the Oauth with Yubikeys is fixed yet?

My work email is behind Okta and I can get through the whole flow of Oauth up till it hits the WebAuthN..which works but it won't display a pin entry dialog.

pr3dr49 11/19/2025||

Sweet memories of several email clients mentioned here.

I also remember the mail client built into the old Norsk version of Opera. I loved that, a much as I loved that browser.

I take it mutt still does not have native Microsoft Exchange support?

kmarc 11/20/2025|

Davmail is the shim I used to proxy OWA / exchange ansmd present an IMAP interface towards neomutt. Used this setup with three companies, worked well, and unified the UX instead of the different Gmail and Outlook web slowness.

self_awareness 11/20/2025||

Doesn't work for me, and the account creation window itself is buggy with poor UX, throws a general error and requires me to retype password each time I try to use a different set of settings.

yellowapple 11/19/2025|

Fantastic news! I've been hoping for Exchange support for a long while.

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