Email Server

                             Google Apps

Commercial by Google | Mac, Windows, Linux, Web / Cloud, Chrome OS

Google Apps is a service that provides independently customisable versions of several Google products under a custom domain name. It features several Web applications with similar functionality to traditional...

  Backup & Sync, Office & Productivity   calendar, online-backup, cloud-computing, anti-spam, collaboration, team

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13

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Microsoft Exchange Server

Commercial by Microsoft | Windows, Web / Cloud

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft...

  Online Services, Social & Communications   collaborative, mail-server, messaging-server

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15

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hMail Server

Open Source | Windows

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. It supports the common e-mail...

  Office & Productivity, Online Services   imap, pop3, smtp, mail-server, smtp-server

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9

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iRedMail

Open Source | Linux, BSD, Self-Hosted

A fully fledged, free email server solution, an open source project (GPL v2). Use official binary packages from Linux/BSD distributions, with both i386 and x86_64 support. Easy, fast deployment in LESS...

  Office & Productivity, Online Services   mail-server, dkim, spf

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6

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OpenChange

Open Source | Linux

OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols. Exchange is a groupware server designed to work with Microsoft Outlook, and providing...

  Office & Productivity, Online Services   outlook, exchange, mail-server

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2

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Microsoft Office 365

Commercial by Microsoft | Web / Cloud

Office 365 is a subscription-based online office and software plus services suite which offers access to various services and software built around the Microsoft Office platform.

  Business & Commerce, Office & Productivity, Online Services, Social & Communications   project-management, collaboration

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4

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Expanding Communication

Commercial | Linux

Turnkey Solutions for the Enterprise Cloud Installation, Configuration, and Management tools for enterprise email, collaboration, messaging, video conferencing, file sharing, and file transfers.

  Office & Productivity, Online Services, Social & Communications   cloud-computing, contacts, email-client, cloud-based, jabber

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2

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Citadel

Open Source | Linux, Web / Cloud

Is a collaboration suite (messaging and groupware). It is designed to run on open source operating systems such as Linux or BSD. In order to modernize the Citadel platform for the Internet, the Citadel/UX...

  Office & Productivity, Online Services, Social & Communications   collaboration, chat, calendar, webmail-service, groupware

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2

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Windows Server Essentials

Commercial by Microsoft | Windows

Windows Server Essentials (formerly Windows Small Business Server) is a flexible, affordable, and easy-to-use server solution designed and priced for small businesses with up to 25 users and 50 devices....

  server-monitoring, server-management, server-administration

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2

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Axigen

Freemium by Gecad Technologies | Windows, Linux, BSD, Self-Hosted, Microsoft Office Outlook

Axigen is an integrated email, calendaring & collaboration platform, built on a unique Linux mail server technology, for increased speed & security.