Free Microsoft Exchange Server Alternatives
The best free alternative to Microsoft Exchange Server is Kolab Community, which is also Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Microsoft Exchange Server and 19 is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Microsoft Exchange Server are mailcow: dockerized, Zimbra Collaboration Suite, SOGo and hMail Server.
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.Kolab Community
Is this is a good alternative?YesNo- Freemium • Open Source
42 Kolab Community alternatives- 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.
- - Kolab Community is the most popular Self-Hosted alternative to Microsoft Exchange Server.
- - Kolab Community is the most popular Open Source & free alternative to Microsoft Exchange Server.
Kolab Community Features
Opinions about Kolab Community as a Alternative to Microsoft Exchange Server
mailcow: dockerized
Is this is a good alternative?YesNo- Free • Open Source
- Mail Server
- WebMail Provider
18 mailcow: dockerized alternatives- 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.
mailcow: dockerized Features
Zimbra Collaboration Suite
Is this is a good alternative?YesNo- Freemium • Open Source
- Mail Server
- Calendar App
- Team Collaboration Tool
41 Zimbra Collaboration Suite alternatives- 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.
Zimbra Collaboration Suite Features
Opinions about Zimbra Collaboration Suite as a Alternative to Microsoft Exchange Server
SOGo
Is this is a good alternative?YesNo- Freemium • Open Source
- WebMail Provider
65 SOGo alternatives- Linux
- Online
- Thunderbird
- Cloudron
SOGo is groupware server with a focus on scalability and open standards.
SOGo provides a rich AJAX-based Web interface and supports multiple native clients through the use of standard protocols such as CalDAV, CardDAV and GroupDAV.Share your calendars, address books and mails in.
hMail Server
Is this is a good alternative?YesNo23 hMail Server alternatives- Free • Open Source
- Mail Server
- 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.
hMail Server Features
DiscontinuedhMail Server is no longer supported by the people who created it and has been discontinued – so use it at your own risk.
Opinions about hMail Server as a Alternative to Microsoft Exchange Server
OX App Suite
Is this is a good alternative?YesNo- Free • Open Source
- Mail Server
- WebMail Provider
- Calendar App
20 OX App Suite alternatives- 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.
OX App Suite Features
Opinions about OX App Suite as a Alternative to Microsoft Exchange Server
OpenChange
Is this is a good alternative?YesNo30 OpenChange alternatives- Free • Open Source
- Mail Server
- Linux
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
OpenChange Features
iRedMail
Is this is a good alternative?YesNo- Freemium • Open Source
- Mail Server
69 iRedMail alternatives- Linux
- BSD
- Self-Hosted
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.
Easy, fast deployment in LESS THAN 1 MINUTE. View YouTube Video to check how easy it is.
Works on both no.
grommunio
Is this is a good alternative?YesNo- Freemium • Open Source
- Calendar App
- Web Conferencing Tool
12 grommunio alternatives- 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 Features
Comments about grommunio as a Alternative to Microsoft Exchange Server
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
1Poste.io
Is this is a good alternative?YesNo17 Poste.io alternatives- Free Personal • Proprietary
- Mail Server
- Linux
Full featured solution for your Email server. Native implementation of last anti-SPAM metods, webmail and easy administration included.
Poste.io Features