What authentication protocol is this MSFT application using (roughly speaking)? Is this service equivalent to authenticating with Office365 in the IE browser or does it operate on a different application level?
Also, does it store info in my local credential manager? And, if you happen to know, how long do I stay signed-in?
Finally, is this different than authenticating with Office365 via Powershell?
Microsoft Online Services Sign-In Assistant for IT Professionals RTW
"The MOS SIA can also provide an improved sign-in experience, such that end users can access Microsoft Online Services without having to re-enter their credentials"