I have just finished testing installation of Microsoft Dynamics NAV 2015 on different Server platforms. I’m looking for minimum system requirements for this new release.
On the end, I can tell you that new Microsoft Dynamics NAV 2015 works fine on following system (but only on 64-bit editions):

• Windows Server 2008 R2
• SQL Server 2008 R2 SP2

Of course, NAV 2015 works excellent on all newer systems.

One notice, when you install NAV 2015 on this configuration, you previously have to install Windows PowerShell 3.0. Also, you have to add Windows Search on your Windows Server 2008 R2, adding it from the Server Manager.

More about NAV 2015, after keynote on Directions US (September 14th).