There have been rumors for the past several years that Windows Server would be coming to ARM. - Today, March 8, that rumor became an acknowledged reality, Microsoft officials said that the company is committed to use ARM chips in machines running its cloud services, as its officials told Bloomberg.
Microsoft will use the ARM chips in a cloud server design that its officials will detail at the the US Open Compute Project Summit today, March 8. Microsoft has been working with both Qualcomm and Cavium on the version of Windows Server for ARM, according to company officials.
There's no word from Microsoft (so far) if and when it will begin offering Windows Server on ARM to external customers or partners.