I have Windows 7 Pro running on the Intel server R1304WTTGSR (S2600WT motherboard), but it is unsatisfactory in two respects: (1) Windows 7 only supports 192 GB of memory, while the hardware supports 1.5 TB; (2) Windows 7 doesn't support added video cards properly. With regard to (2), I have not been able to get a satisfactory solution from Intel support (or the company Intel has hired for support).
So, I am wondering whether I could solve both problems by moving to Windows 10, which supports 2 TB. At present, Intel doesn't officially support Windows 10 on this hardware; has anyone tried it? Or maybe Intel is planning future support?
To answer your inquiry, since the R1304WTTGSR is designed for a server environment; there are no intentions from Intel to develop drivers for Windows 10 in the future. The list of fully compatible operating systems can be found here: