The team behind Microsoft's presentation of Windows 10 have done a fair job in making it appear that the entire experience will be slick. Not only easy, that is to say, but looking VERY similar no matter what device you're using. The Photos app will exist in Windows 10 for desktop, Windows 10 for mobile devices (phones at least), and on desktop-like devices in-between. That's convertible devices, tablets, and so forth. One system will provide cross-device browsing of photos and videos no matter where you happen to be.