Sending, receiving, and organizing email in Outlook.com
Check the From line carefully, particularly the address. Also inspect any links by hovering over them.
I have not seen this mail (I don't use outlook.com), but it sounds very much like a scam of some sort. And if the From address is some random domain, or links are pointing to strange places you've never heard of before, it definitely is a scam. Don't click on any links!
Note that the From address may actually be microsoft.com, as the spammers may be to trick that. But the links will always go to mysterious places on the web where you should not go.