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Mailbird vs Microsoft Outlook: catalog facts
Mailbird	Microsoft Outlook
Paid Paid desktop app, sold as a one-time or subscription license.	Freemium Free app and account available; Microsoft 365 plans add paid features and Office apps.
Windows, macOS	Windows, macOS, Android, iOS, Web
Unifies multiple email accounts and providers into one inbox App integrations reduce the need to switch to separate tools	Email, calendar and contacts for multiple accounts in one app Available on desktop, mobile and web
Windows and macOS only Full feature set requires a paid license	Closed source and tied to Microsoft services Some features, including Copilot, require a paid plan
Downloadable app	Downloadable app, Web application
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 22, 2026	Official website Full listing and sources Checked September 23, 2026

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