Open-source alternatives to Microsoft 365

One open-source project is offered as a replacement for Microsoft 365: Sogo. Running one yourself trades the subscription for your own hosting and upkeep, so the table below leads with what decides that trade: whether the project is alive, what its licence lets a business do, and whether there is a container command to start from.

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  Sogo2,174 stars · copyleft · active

  SOGo is a very fast and scalable modern collaboration suite (groupware). It offers calendaring, address book management, and a full-featured Webmail client along with resource sharing and permission handling. It also makes use of documented standards (IMAP, CalDAV, CardDAV, etc.) and thereby provides native connectivity (without plugins) to many clients such as Microsoft Outlook, Apple iCal, the iPhone, Mozilla Lightning, and a plethora of mobile devices.

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Which projects are offered against Microsoft 365 comes from opensourcealternative.to, re-read weekly. Every figure in the table is read from the project’s own repository. We have not run these projects, and we hold no price for Microsoft 365. Browse every open-source alternative.