Open Source Microsoft Exchange Server Alternatives
The best open source alternative to Microsoft Exchange Server is Kopano, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Microsoft Exchange Server and 18 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Microsoft Exchange Server are hMail Server (Free, Open Source), Zentyal (Paid, Open Source), mailcow: dockerized (Free, Open Source) and Zimbra Collaboration Suite (Freemium, Open Source).
- Kopano puts an email, video meetings, calendaring, and file sharing solution within one single interface. View 25 alternatives to Kopano
- 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 vs Microsoft Exchange Server
hn1 Kopano has scalable backend and can do full MAPI server and clientside. The Webapp and Deskapp has intuitive and modern UI/UX.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.marcski Stable and cheap backend, flexible frontend support, open source, in full control of your databobsp Scalable, open source with a great UX and it has all the features I needOpenSource, better to maintain, "not Microsoft" - 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. View 25 alternatives to hMail Server
- Free • Open Source
- Windows
- Zentyal is a native Microsoft Active Directory implementation on Linux incorporating all the network services required in a small and medium business environment: Directory &... View 28 alternatives to Zentyal
- Paid • Open Source
- Linux
Zentyal vs Microsoft Exchange Server
No Exchange alternative and no support for MS Outlook ClientWhile the comments below suggest that this is AD, not exchange replacement. It was supposed to ship with SoGo / openchange as a managed add-on. You also strangely enough can't have exchange without AD. but guests do keep on posting. Exchange is just an Add-On to AD. (It extends the schema).Not an Exchange alternative at all. Does basic AD but that is about it. It is more of a gateway server.They do not share any common functionality. Zentyal is an Active Directory substitute, Microsoft Exchange is a groupware E-Mail (enterprise grade) server. - 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. View 16 alternatives to mailcow: dockerized
- Free • Open Source
- Linux
- Self-Hosted
- Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. View 44 alternatives to Zimbra Collaboration Suite
- Freemium • Open Source
- Linux
- Online
- Self-Hosted
- Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite. View 41 alternatives to Kolab CommunityNo screenshots yet
- Freemium • Open Source
- Linux
- Online
- Self-Hosted
- SOGo is groupware server with a focus on scalability and open standards. View 65 alternatives to SOGo
- Freemium • Open Source
- Linux
- Online
- Thunderbird
- Cloudron
- A fully fledged, free email server solution, an open source project (GPL v2). Use official binary packages from Linux/BSD distributions, with both i386 and x86_64 support. View 67 alternatives to iRedMail
- Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure. View 74 alternatives to Kolab Now
- Paid • Open Source
- Online
- Software as a Service (SaaS)
- DAVdroid
Kolab Now vs Microsoft Exchange Server
With Microsoft no longer supporting our existing setup, this was a great alternative. - Blue Mind is a complete solution of company messaging, calendars and collaborative work. View 10 alternatives to Blue-Mind
- Paid • Open Source
- Linux