I got an email from Microsoft (windows@communication.microsoft.com) saying "Welcome to Windows 10 -- again". Apologizes for an earlier incorrect email (?) and offers links to introduce various Windows 10 features. The first link is "Open the Get Started App." If I hover over it, the link is (I added XX to foil the actual address): http://XXcommunication.microsoft.com/Key-8101501.C.Dbf7.1.K3.-.nF3PmRf, but when I click it, I see it switch to XXchrome-extension://cjabmdjcfcfdmffimndhafhblfmpjdpe/RedirectPages/PAGEBADREDIRECT.HTML which says it is a Norton Safe Web message saying that this link is DANGEROUS, DON'T OPEN IT.
Since the email address this message came to (a hotmail account) is not one I use for my Windows setup, I wonder if the entire email is a scam.