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Apache OpenOffice vs Microsoft 365: catalog facts
Apache OpenOffice	Microsoft 365
Free Free and open source under the Apache 2.0 licence, maintained by the Apache Software…	Freemium Free web versions are available. Desktop apps require a paid subscription.
Windows, macOS, Linux	Windows, macOS, Android, iOS, Web
Six familiar applications in one install Reads and writes the OpenDocument standard	The reference implementation of the formats everyone else has to match Desktop, web and mobile apps with real-time co-authoring
Cannot save in .docx or .xlsx, only open them Releases are years apart; the 4.1 line dates from 2014	Subscription pricing, with the desktop apps behind it Closed source, and heavily tied to a Microsoft account
Downloadable app	Downloadable app, Hosted service
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	Account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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