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.

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

Open Source

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

An open source mailserver suite.

Open Source

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

Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

9 hours ago - It does include a proprietary software set optimized for business users, students, researchers and developers." A list of features and further details can be found in the company's release announcement.

Web-based IMAP email client

Open Source

Home, overview and getting started with Puppy Linux, amazingly fast, fascinatingly complete and delightfully small Linux.‎Wiki · ‎Download latest Puppy Linux .

Modernisieren Sie Ihre Infrastruktur mit SUSE Linux Enterprise Server, OpenStack Cloud-Technologie für IAAS und softwaredefiniertem Storage von SUSE.

DeLicate Linux is a free and lightweight Linux Kernel-based operating system that is intended for computers comprising of very Low RAM.

Fuduntu is an open-source appropriation of Linux, a remix of the Fedora working framework, which thusly depends on the honor winning Red Hat Enterprise Linux OS.

Xubuntu – Xubuntu is an elegant and easy-to-use operating system. Download XubuntuXubuntu – Xubuntu is an elegant and easy-to-use operating system. Feature Tour.

Haiku is an open source OS catered specifically to the needs of personal computing.

Open Source