Free Microsoft Exchange Server Alternatives
The best free alternative to Microsoft Exchange Server is Kopano, which is also Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Microsoft Exchange Server and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Microsoft Exchange Server are hMail Server, mailcow: dockerized, Zimbra Collaboration Suite and Kolab Community.
Microsoft Exchange Server alternatives are mainly Mail Servers but may also be WebMail Providers or Calendar Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Microsoft Exchange Server.- Paid • Proprietary
- Windows
- Online
- Freemium • Open Source
- Mac
- Windows
- Linux
- Online
- Android
- iPhone
- Android Tablet
- Windows Phone
- iPad
- Self-Hosted
- Microsoft Office Outlook
- S/MIME
- Software as a Service (SaaS)
Kopano puts an email, video meetings, calendaring, and file sharing solution within one single interface.
Kopano vs Microsoft Exchange Server opinions
hn1Kopano has scalable backend and can do full MAPI server and clientside. The Webapp and Deskapp has intuitive and modern UI/UX.
bobspScalable, open source with a great UX and it has all the features I need
marcskiStable and cheap backend, flexible frontend support, open source, in full control of your data
OpenSource, better to maintain, "not Microsoft"
I tried a lot of MS alternatives, OX, Zimbra, Zentyal, but what fits most with Outlook Sync was the new Kopano, it's more flexible. You can use the web app or desktop app too.
- Free • Open Source
- Windows
hMailServer is a free e-mail server for Microsoft Windows. Its used by Internet service providers, companies, governments, schools and enthusiasts in all parts of the world.
- Free • Open Source
- Linux
- Self-Hosted
mailcow is a mail server suite based on Dovecot, Postfix, SOGo, Rspamd and other open source software, that provides a modern Web UI for administration.
- Freemium • Open Source
- Linux
- Online
- Self-Hosted
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
- Freemium • Open Source
- Linux
- Online
- Self-Hosted
Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to us, and hope that it is important to you thereafter.
No screenshots yet- Freemium • Open Source
- Linux
- Online
- Thunderbird
- Cloudron
SOGo is groupware server with a focus on scalability and open standards.
A fully fledged, free email server solution, an open source project (GPL v2).
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
No screenshots yet- Free • Open Source
- Linux
- Online
- Self-Hosted
- Software as a Service (SaaS)
The OX App Suite by Open-Xchange is web-based platform offering a suite of apps like an email client, calendar, contacts magement, cloud storage with synchronization and productivity apps for word processing, spreadsheets and presentations.
- Freemium • Open Source
- Mac
- Windows
- Linux
- Online
- Android
- iPhone
- iPad
- Self-Hosted
grommunio (formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration.
grommunio vs Microsoft Exchange Server opinions
norbertlambingAs the first open source solution to offer a full-featured OutlookAnywhere (RPC over HTTP) and MAPI/HTTP implementation, grammm is the alternative to proprietary backends for native interoperability with Microsoft Outlook