Is there an easy way to sign into just the Store, on one of my devices I logged into the store and it converted my local account to my MS account. I had the option to convert back to a local account but it shouldn't force it by default. With win8.1 I was able to keep my account local and sign into individual apps.
Solution: tenforums.com/user-accounts-family-safety/11964-local-account-signing-into-windows-store.html