The Best 40 Microsoft Exchange Server Alternatives
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34 LikeKolab Community
Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.
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27 LikeZimbra Collaboration Suite
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.
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19 Like
hMail Server
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.
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17 Likemailcow: dockerized
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.
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14 Like
MDaemon Messaging 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.
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10 LikeOX Open-Xchange
Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.
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7 LikeAtmail Email Server
Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.
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7 Like
OpenChange
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
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7 LikeKerio Connect
Kerio Connect makes email, calendars, contacts and task management easy and affordable.
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7 Like
eGroupWare
Egroupware is a web based software for team collaboration, central data management and CRM: email client, online calendar, contact and task management, project and file management, trouble ticket system, synchronization.
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