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Fastmail vs Zimbra: catalog facts
Fastmail	Zimbra
Paid Paid subscription with a 30-day free trial that needs no credit card.	Paid Sold in several editions under Zimbra's license terms; see the edition comparison.
Android, iOS, Web	Web, Self-hosted
Email, calendar and contacts in one service Choice of EU or USA data residency	Mail, calendar and contacts in one web client Can be run on your own servers
No free plan after the trial Hosted service, so your mail lives on Fastmail's servers	Aimed at organisations rather than individuals Running a mail server takes administration effort
Downloadable app, Web application, Hosted service	Self-hosted, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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