Windows Defender ATP is a cloud service that senses the issues among Windows device that you manage, and then provide you the intelligence to fix the issues. Details can be found here: 

If partners want to purchase Windows Defender ATP there is two ways of how that can be achieved: 

Included in: 

  • Windows 10 E5
  • and 
  • Microsoft E5
  • Optional as add-on for: SKU: Microsoft 365 E5 Security (see Office 365 price list for pricing details)
  • Microsoft 365 E3
  • and 
  • Office 365 E3