Managing personal Outlook.com account settings, security, and privacy
Hello Terry
Without seeing the exact email along with the underlying links, it's impossible to "definitively" say whether it's scam or not. That being said, really does sound like a phishing scam and would not click on any link in the message and certainly would not provide any so-called "verification info".
To verify whether a link in the message is valid (points to a valid Microsoft URL), hover your mouse over the link and see where it actually points to OR right-click on the link --> select <copy> --> paste it in any text editor (i.e. Notepad).
FWIW - not aware of anything related to "We are closing all old version of our Mailbox as from July 25"