Mail and Calendar is an email client by Microsoft that comes bundled inside the Windows 10
Ranked in these QuestionsQuestion Ranking
Pro Supports multiple services including GMail
Mail and Calendar support multiple accounts from multiple services, including Gmail and Google Apps. Gmail and Google Apps support was not available on Windows 8. It is available on the Windows 10 version of Mail and Calendar app.
Pro Send email from Outlook.com aliases
An alias is a great feature for keeping your email private
Pro Drag and drop calendar events to reschedule them (PC only)
If you like using a calendar, this is an efficiency perk.
Pro Swipe functionality
If your device has a touchscreen, then user can swipe the message thread either from left or from right, varies by swipe preferences set by user, eg: set swipe from right to delete and swipe from left to archive.
Pro Background wallpaper
Similar to Yahoo! Mail and Gmail web app, Mail app can allow users to set any images as image background of the app.
Con Missing some advanced features
The Mail app is missing some advanced features that can be found in other products such as automatic template replies, email filters and custom notification sounds.
Con No custom signature with HTML or images
You will miss the option to customize the signature with HTML content and images.