Microsoft Exchange Server Alternatives

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

hMailServer is a free e-mail server for Microsoft Windows.

All you need for your media management and collaboration. Ideal for film post-production, sales and distribution.

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

Web-based IMAP email client

Microsoft Office is an office suite of desktop applications, servers, and services for the Microsoft Windows and OS X operating systems.

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

Axigen is an integrated email, calendaring & collaboration platform, built on a Linux mail server technology.

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

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

An open source mailserver suite.

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

KerioConnect is a commercial mail and groupware server.

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