Windows 10 - Remove Mail and Calendar

When setting up in built Mail app you may have:

"You must make your PC more secure to connect to this server...

Enforce these policies"

Removing the suspect email account may result in an Error with no further useful information.

Remove the Mail (and Calendar) app:

Powershell as admin:

Get-AppxPackage *windowscommunicationsapps* | Remove-AppxPackage

To re-install:

Get-AppxPackage -AllUsers| Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”}