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Microsoft Outlook vs Mailbird: catalog facts
Microsoft Outlook	Mailbird
Freemium Free app and account available; Microsoft 365 plans add paid features and Office apps.	Paid Paid desktop app, sold as a one-time or subscription license.
Windows, macOS, Android, iOS, Web	Windows, macOS
Email, calendar and contacts for multiple accounts in one app Available on desktop, mobile and web	Unifies multiple email accounts and providers into one inbox App integrations reduce the need to switch to separate tools
Closed source and tied to Microsoft services Some features, including Copilot, require a paid plan	Windows and macOS only Full feature set requires a paid license
Downloadable app, Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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 September 22, 2026

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