Unusual sign-in activity

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" <mbaucom@coloradocollege.edu>
Subject: Unusual sign-in activity

Microsoft account
Unusual sign-in activity
We detected something unusual about a recent sign-in to the Microsoft account user@example.com.
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
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The Microsoft account team