Microsoft Mail and Calendar

Mail and Calendar apps already built in Windows 10.

20 Alternatives To Microsoft Mail and Calendar

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OpenProject

OpenProject is an open-source project management software with a wide set of features and plugins.
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Outlook

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
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Spark

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

The Bat

The Bat! is a secure desktop email client for Windows, designed to protect your correspondence against third-parties and to save your time.

TypeApp

TypeApp - The best Android and iOS email app ever created for mobile devices. Fast, simple and easy, TypeApp is the best email app for Android and iOS
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eM Client

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