As noticed by Tom Warren of The Verge and reported by iMore, Microsoft has created a method that takes the data from a Passbook file and converts it into a card that is imported into Microsoft Wallet.
It is not known whether Microsoft's system is operating independently of Apple or if the Redmond company has an agreement to convert the data to its own wallet. The service may not support iOS-specific features like Passbook updates and notifications, but the importing of data is apparently accurate.Passbook passes are just collection of data that get rendered into a card and displayed in Apple's Passbook app. Think of the Passbook files like the HTML, CSS, and JavaScript data that makes up a webpage, and the Passbook app like the browser that renders the actual page. It looks like Windows Phone 8 is taking the same data and rendering a similar card out of it, and then pushing that card to Microsoft Wallet.
Windows Phone 8.1 supports Apple s Passbook natively. I ve been using it for flights. Works perfectly pic.twitter.com/MFScqvEVU7 - Tom Warren (@tomwarren) April 14, 2014
Article Link: Windows Phone 8.1 Adds Support for Apple's Passbook Passes