Windows 8 and Windows Server 2012 introduce the latest operating system technology and software development platforms for use by app developers and enterprises worldwide. As part of further enhancing the security, reliability, performance, and user experience of Windows, Microsoft has introduced many new features, improved existing features, and removed others.
While the goal of Windows 8 and Windows Server 2012 is to stay highly compatible with most of their respective apps written for previously released operating systems, some compatibility breaks are inevitable due to innovations, tightened security, and increased reliability. Overall, the compatibility of Windows 8 and Windows Server 2012 with existing apps is high.
See the rest of the information in the cookbook download @ http://www.microsoft.com/en-us/download/details.aspx?id=27416.