When you access Office 365 outside of our network, you typically get a text message to your phone. The text, in addition to your password, provides the “multi” factor authentication.
Our current Office 365 multi-factor solution that sends the text message, is a located in our data center. This migration moves that workload to the Microsoft cloud solution of Office 365.
It should be a fairly seamless transition as we take your existing phone number and import it into this new solution.