Windows 8 & Windows Server 2012 has now been certified by Microsoft to work with Microsoft Dynamics NAV 2013.
In Addition, Microsoft has tested Microsoft Dynamics NAV 2009 R2 and has certified it as compatible with Windows 8 & Windows Server 2012 as well. Both in 32 bit and 64 bit flavors.
Versions prior to that are officially unsupported at this time. We may be able to assist and get it to work via various compatibility options and settings but it would have to be tested and handled on a case by case basis. Microsoft is also supporting Microsoft SQL Server 2012 with these releases. The document below outlines all additional resources, assorted browsers and other components that are supported.
It’s likely you will end up with a Windows 8 machine as you upgrade workstations so having this information can be very helpful.