First things first: if you've received a message asking you to update or verify your Microsoft account security info, you probably want to know why.
To help protect your personal data, we're asking everyone with a Microsoft account to make sure the security info associated with their account is correct and up-to-date. When your security info (like an alternate email address or phone number) is current, we can use it to verify your identity if there's ever a problem. For example, if you forget your password, or if someone else tries to take over your account, Microsoft uses your security info to help you get back into your account.
For a quick overview of how to add security info to your account, watch the following video.