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Microsoft Outlook vs Spike: catalog facts
Microsoft Outlook	Spike
Freemium Free app and account available; Microsoft 365 plans add paid features and Office apps.	Freemium Free for individuals; paid plans add AI and team features.
Windows, macOS, Android, iOS, Web	Windows, macOS, Android, iOS
Email, calendar and contacts for multiple accounts in one app Available on desktop, mobile and web	Chat-style layout can make long threads easier to follow AI features aim to help with organizing and responding faster
Closed source and tied to Microsoft services Some features, including Copilot, require a paid plan	Chat-style format is a matter of preference and not for everyone Advanced AI and team features require a paid plan
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.