Microsoft Exchange Server

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.

19 Alternatives To Microsoft Exchange Server

Citadel

Is a collaboration suite (messaging and groupware).
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G Suite

Google’s encompassing suite of cloud-based business apps.

Horde

Horde Groupware is a free, enterprise ready, browser based collaboration suite.

Kerio Connect

KerioConnect is a commercial mail and groupware server.

Kolab Community

Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.

Kopano

Sharing & communication software for business
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MDaemon Messaging Server

Low cost, easy to use Email Server software for virtual, on-premise, or hosted deployments for…

OX Open-Xchange

Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.

OpenChange

OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and…
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ProtonMail

Secure email with absolutely no compromises. Get your free encrypted email account today.

Roundcube

Web-based IMAP email client

SOGo

SOGo is groupware server with a focus on scalability and open standards.

Zentyal

Linux directory, domain, mail, gateway and infrastructure server for SMBs.

Zimbra Collaboration Suite

Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.
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Zoho One

Zoho is an all-in-one online office suite.

eGroupWare

EGroupware is free open source groupware software intended for businesses from small to enterprises.
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iMail

Fast, safe, heavy mail solution.

iRedMail

A fully fledged, free email server solution, an open source project (GPL v2).

mailcow dockerized

An open source mailserver suite.