Microsoft Mail and Calendar

Mail and Calendar apps already built in Windows 10.

20 Alternatives To Microsoft Mail and Calendar

Airmail

Airmail is a lightweight and lightning fast mail client for Mac.
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Apple Mail

There’s big news attached.
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Claws Mail

Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response
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Evolution

Apps/Evolution - GNOME Wiki!
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Geary

Geary is an email application built for GNOME 3.

Kontact - KMail

Email client by KDE, supporting POP3 and IMAP mailboxes.

Mailbird

Mailbird is the best email client for Windows 7, 8 and 10

Mailspring

Mailspring is a mail client for Mac, Windows and Linux.

Mutt

Add forums and commenting to your site. Unlimited posts, users and traffic, for free. Embeddable, styleable and scriptable.
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OpenProject

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

Opera Mail

Opera Mail powerfully organizes, indexes, and sorts your messages.
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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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Postbox

The Power Email App for busy professionals, like you.
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SlideMail

Making email better through artificial intelligence.
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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

Sylpheed

Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).

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.

mBoxMail

mBox Mail is a fast, full-featured Hotmail client for iOS devices.