Mail and Calendar

Mail and Calendar is an email client by Microsoft that comes bundled inside the Windows 10.

Calendar

Calendar is a time-management web application by Microsoft.

GyazMail is an advanced level of an email account management system for the Mac OS X operating system users.

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Rainlendar - Customizable desktop calendar

eM Client is a Windows-based email client for sending and receiving emails, and managing calendars, contacts and tasks.