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Microsoft Outlook vs iCloud Mail: catalog facts
Microsoft Outlook	iCloud Mail
Freemium Free app and account available; Microsoft 365 plans add paid features and Office apps.	Freemium Free with an Apple Account, with more storage on paid iCloud+ plans.
Windows, macOS, Android, iOS, Web	macOS, iOS, Web
Email, calendar and contacts for multiple accounts in one app Available on desktop, mobile and web	Built into Apple devices Web client for use on any computer
Closed source and tied to Microsoft services Some features, including Copilot, require a paid plan	Requires an Apple Account Best experience is on Apple hardware
Downloadable app, Web application	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	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 24, 2026

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