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Evolution vs Thunderbird: catalog facts
Evolution	Thunderbird
Free Free and open source, part of the GNOME project.	Free Free forever, funded by donations.
Linux	Windows, macOS, Linux, Android
Mail, calendar, contacts and tasks in one program Exchange Web Services plugin connects to Microsoft 365	Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four
Linux only Heavier than a mail-only client, and slower to start	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
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.