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).
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
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…
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.
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.
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.