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Microsoft Outlook vs Pegasus Mail: catalog facts
Microsoft Outlook	Pegasus Mail
Freemium Free app and account available; Microsoft 365 plans add paid features and Office apps.	Free Free to use; the developer accepts donations.
Windows, macOS, Android, iOS, Web	Windows
Email, calendar and contacts for multiple accounts in one app Available on desktop, mobile and web	Free with no paid tier Decades of continuous development
Closed source and tied to Microsoft services Some features, including Copilot, require a paid plan	Windows only Traditional interface and slow release pace
Downloadable app, Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account 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 September 23, 2026

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