Mail & Calendar app has been updated in Windows Store for both Windows 10 for Desktop and mobile. The update seems to be minor with no new features. But, the changelog says there are new features. However, it looks like old, read the changelog below:

• Add holidays to your calendar

• View an entire year at a glance with Year view

• Move messages to a folder of your choice with a new swipe Quick Action

• Add attachments by pasting them into the body of your message

• Find text within the email reading pane