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Evolution vs Betterbird: catalog facts
Evolution	Betterbird
Free Free and open source, part of the GNOME project.	Free Free and open source, funded by donations.
Linux	Windows, macOS, Linux
Mail, calendar, contacts and tasks in one program Exchange Web Services plugin connects to Microsoft 365	Fixes and features Thunderbird has not shipped, listed openly in a comparison table Installs next to Thunderbird and runs on the same profile, so switching back is trivial
Linux only Heavier than a mail-only client, and slower to start	A small volunteer project riding on someone else’s release train The Mac build ships in English only and needs a language pack for anything else
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later and LGPL-2.1-or-later	License: MPL-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 20, 2026

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