Using Outlook for iOS in business environments for email and scheduling
Hi. I'm Brian and I will do my best to help you.
As far as I can tell, Microsoft does not monitor data breaches. It's unlikely that the Microsoft user database was compromised. Rather, it's more likely that you've used your Microsoft address on another service and it is that service that has been compromised or leaked. Your browser should tell you what has been compromised. Otherwise, sign up for https://haveibeenpwned.com/