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FairEmail vs Microsoft Outlook for iOS and Android: catalog facts
FairEmail	Microsoft Outlook for iOS and Android
Free Free to download from Google Play, F-Droid or GitHub releases.	Freemium The app is a free download; Microsoft 365 plans are sold separately.
Android	Android, iOS
Works with nearly all IMAP providers and unlimited accounts OpenPGP and S/MIME encryption built in	Email, calendar and contacts in one app Available on both iOS and Android phones and tablets
No Microsoft Exchange Web Services or ActiveSync support Android only	Closed source Closely tied to Microsoft's services and plans
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
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 September 23, 2026

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