What are some alternatives?
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Gmail - Gmail is a free search-based web-mail service.
eM Client - eM Client is a Windows-based email client for sending and receiving emails, and managing calendars, contacts and tasks.
Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.