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Thunderbird vs Evolution: catalog facts
Thunderbird	Evolution
Free Free forever, funded by donations.	Free Free and open source, part of the GNOME project.
Windows, macOS, Linux, Android	Linux
Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four	Mail, calendar, contacts and tasks in one program Exchange Web Services plugin connects to Microsoft 365
The interface carries a lot of history and can feel dense next to a webmail tab Major ESR releases have historically been disruptive for add-ons and settings	Linux only Heavier than a mail-only client, and slower to start
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: GPL-2.0-or-later and LGPL-2.1-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.