After all that was said and done, it’s amazing that Microsoft will finally get some credit for Windows Phone 7 from Apple. Unfortunately, this recognition comes in a roundabout way. After criticizing Microsoft for creating a "flat, unimaginative, simple" concept of a social OS, iOS 4.3 beta is showing signs of having ripped off features from Windows Phone 7.
It turns out there is a "Photo Stream" feature that looks out for pictures uploaded by your contacts into MobileMe much like the What’s New section in the Pictures Hub in Windows Phone 7 goes out and gathers pictures posted by anyone in your contacts. That is not the complete extent of Windows Phone 7, just the social aspect of the hub… it has several more hub pages with the typical sections you would find in a Picture application such as Galleries, Albums (or folders, whichever your user interface), sample pictures, favorites, most recent, etc.
I am not sure what the legal extent of Microsoft patents really are with regards to the "hub plus social" concept , but I wouldn’t be surprised if a round of lawsuits would start out of this event.