I haven't had time to go look into it. . . so I am not certain it is actually coming from Microsoft. Each of these clients who are getting this are on Cloud based vertical solution software for their businesses. I try it here on my Windows 7 Pro VM install using their software, and I don't see it. I am beginning to think it's the company's providing that that has the problem, and only on their links, not Microsoft, and/or their ISPs. Any ideas? For now, I've just told them to keep saying no to the pop-ups.
Never seen a damn thing about 10 on my 7 Pro box, but I do not do any cloud thing, whatever that is. Updates are notify only, and I never do anything.
Are your business clients not running an Active Directory domain? A $400 copy of Server 2012 R2 Essentials will give them the ability to run an AD domain and with it, group policy. Then, with group policy, you turn off anything and everything you want related to upgrades.