Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
BlueMail - BlueMail is an email management app for Android, iOS, and Windows.
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
MailDroid - MailDroid is an email app that you can use to manage your emails from multiple vendors in one unified inbox.