Although this is an example of a phishing email, there are other emails of this type that are legitimate. If you suspect a problem, please contact your computing helpdesk.
From: "Microsoft" <email@example.com>
Subject: Unusual sign-in activity
Microsoft account Unusual sign-in activity We detected something unusual about a recent sign-in to the Microsoft account firstname.lastname@example.org. Sign-in details Country/region: United States IP address: 64.57.xxx.xxx Date: 12/18/2017 08:45 AM (CST) Platform: Windows Browser: Chrome Please go to your recent activity page to let us know whether or not this was you. If this wasn't you, we'll help you secure your account. If this was you, we'll trust similar activity in the future. Review recent activity To opt out or change where you receive security notifications, click here. Thanks, The Microsoft account team