Zimbra - 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.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
YouTeam - YouTeam is a new, smarter way to outsource.
Pegasus Mail - Pegasus Mail has been in existence longer than any other PC email client.