This is a typical example of a phishing email. If you click on the link the bad guys will harvest your username and password and start using them to access you email inbox, send emails or worse.
This is a 'obvious' fake email, but people keep getting caught out so I will keep reminding you. Admin and management staff, consider sending this information on so your staff can be reminded.
Multi factor authentication on your Microsoft account will mitigate the impact of being fooled into clicking this. Talk to me if you want this turned on.