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KMail vs Evolution: catalog facts
KMail	Evolution
Free Free and open source under the GPL.	Free Free and open source, part of the GNOME project.
Linux	Linux
OpenPGP and S/MIME encryption integrated rather than bolted on Shares contacts and calendar with the rest of the Kontact suite	Mail, calendar, contacts and tasks in one program Exchange Web Services plugin connects to Microsoft 365
Depends on the Akonadi storage service, which is a common source of problems Linux only in practice	Linux only Heavier than a mail-only client, and slower to start
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0-or-later and LGPL-2.1-or-later
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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