CrossBox Alternatives

Web-based IMAP email client

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.

RainLoop is a web based email client.

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

Webmail is an open-source webmail script for existing IMAP servers.

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

Network Solutions - Original domain name registration and reservation services with variety of internet-related business offerings. Quick, dependable and reliable.

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

Apache James is a pure Java SMTP, POP3 enterprise mail server.

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

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

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