Microsoft has a goal of bringing Windows 10 on 1 billion devices by 2017 and the company is obviously trying everything to make sure that it successfully completes this mission.
Most recently, the company has started displaying Windows 10 upgrade ads on computers that are part of domains, telling users that IT admins are the ones that block the install of the new OS.
“Your system administrator has blocked upgrades on this PC Check with your system administrator about upgrading this PC to Windows 10. Are you a system administrator? You can customize this app to get your organization upgraded to Windows 10. Find out how,” one such ad displayed on a domain-attached PC reads.
In other words, yes, you can have Windows 10 running on your computer, but no, your administrator does not allow you to. So Microsoft’s more or less trying to make users ask their IT admins to install Windows 10, which in the end should be a win-win situation.