If you get an email about unusual activity on your Microsoft account, or if you’re worried that someone else might have used your account, go to the Recent activity page. You’ll see when your Microsoft account was signed in during the last 30 days, along with any device or app-specific info.

Sign in to your My Account page with your work or school account. Select My sign-ins or select the Review recent activity link from the My sign-ins block. Expand and review each of the sign-in items, making sure that you recognize each one.

After signing into your Microsoft Account, select the Security tab and choose to View my activity under the Sign-in activity section. On the Recent Activity page that shows up, you’ll then see a list of login attempts.