Let's see what "shared responsibility model" means. If Microsoft is not lying to customers, this means the first thing they should do is investigating whether

Let's see what "shared responsibility model" means. If Microsoft is not lying to customers, this means the first thing they should do is investigating whether or not the flaw was exploited in any of the tenants at no cost for the customer. Or...wait a second... No they aren't, they already asked customers to reset their keys, which basically means they did not investigate. Shared responsibility my a..!