OpenChange is described as 'Aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols' and is a Mail Server in the online services category. There are more than 25 alternatives to OpenChange for a variety of platforms, including Windows, Linux, Web-based, Self-Hosted and Mac apps. The best OpenChange alternative is Nextcloud Hub, which is both free and Open Source. Other great apps like OpenChange are Infomaniak kSuite, Zimbra Collaboration Suite, Kopano and hMail Server.
Low cost, easy to use Email Server software for virtual, on-premise, or hosted deployments for companies that want control of their email. Integrated web-mail with doc sharing, Drop Box integration, client and server side encryption.
United Kingdom
Full featured solution for your Email server. Native implementation of last anti-SPAM metods, webmail and easy administration included.
All-in-one European business email and collaboration platform — email, chat, video conferencing, and office suite in one app. Cloud or self-hosted.
Czechia
EU
OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices.
Open Source Collaboration, providing integration with your existing Linux mailserver, native mobile phone support, Outlook "Look & Feel" webaccess and stable Outlook sharing (100% MAPI).
The Mercury Mail Transport System is a mail server that sends and receives messages on behalf of a group of users on a machine or local area network. Messages from the outside world are received by Mercury and delivered to the users, who can access it at any later point.
Turnkey Solutions for the Enterprise Cloud
Installation, Configuration, and Management tools for enterprise email, collaboration, messaging, video conferencing, file sharing, and file transfers.
James stands for Java Apache Mail Enterprise Server! It has a modular architecture based on a rich set of modern and efficient components which provides at the end complete, stable, secure and extendable Mail Servers running on the JVM.
Australia
Fast, safe, heavy mail solution. Web-client access, LAN or WAN self-hosted server, maintenance-free design. No Windows server and database server required, unlimited mail accounts, storage, attachment size, custom logo. Free for commercial use.
China
Sanwhole Exchange is a server running iMail, iPress and iStore services. iMail is an enterprise-class email server does Microsoft Exchange and Gmail work. iPress sets blog, forums and tickets in one. iStore is an online store.
China
Xeams is a secure and powerful mail server for that includes a powerful spam filtering engine that eliminates up to 99% of junk email right out of the box. The software offers a flexible approach to email, making it a very user friendly server.
New Zealand
United States
