This article will cover what pre-requisites need to be completed before you start protecting data with Microsoft 365 Business.
Microsoft 365 User
Windows devices must be running Windows 7 Pro, Windows 8 Pro, or Windows 8.1 Pro. See How to Upgrade to Required Version of Windows 10 Pro
Remove devices from mobile management solutions (Mobile Iron, AirWatch, etc.). You will enrol all the people in your organisation to Microsoft 365 Business mobile management
Apple iOS 8.0 or later. Google Android 4.0 and later