Office 365 Preactivated

A: Yes. Windows Defender classifies KMS activators as "HackTool:Win32/AutoKMS" and removes them immediately. You would have to disable your antivirus to install it—which is a terrible security practice.

Using violates Microsoft's Software License Terms. For an individual, Microsoft rarely sues end-users. However, they do sue resellers, and they can blacklist your Microsoft Account. office 365 preactivated

Microsoft 365 is inherently connected to the cloud. When you use a preactivated version, you are still signing in with a Microsoft Account to save files to OneDrive. A: Yes