Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Evolution - Apps/Evolution - GNOME Wiki!
Geary - Geary is an email application built for GNOME 3.
The Complete Exam - Dental Software and Dental
Curve Hero - Curve Hero is a dental practice management that delivers office management via cloud, allowing you to access your patient data from anywhere
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.