New
#30
It was a shotgun eMail ... I received it too. I was confused because I'm running 8.1 - did MS have wrong information about my machine? Did I enter the wrong version somewhere when I registered for the Insider Program or set up an MS account?
After reading about the KB required to upgrade and how to tell if the KB was installed (Search icon on Start) I realized it was a blanket eMail.
Pretty much as you said Miles, marketing sparkle. It pissed me off because I wasted time double checking my machine and I'm an active Insider (as well as being active on other MS real estate). They really need to be more selective in the marketing campaign.