Microsoft partners with Qualcomm and Cavium to develop Windows for servers using ARM processors, has been testing it in Azure for search, storage, more
Context & Ripple Effects
Microsoft's move to run Windows Server on ARM inside Azure extends an ARM push that began on the client side: three months earlier it announced emulation tech letting Windows 10 on ARM run x86 Win32 apps with Qualcomm. Now the same architecture question moves into the datacenter, with Qualcomm joined by Cavium as silicon partners and search and storage workloads already testing in Azure.
The significance is what came after: the 2017 partnership seeded a line of development running through reports of Microsoft designing its own server and Surface chips, ARM-based Azure virtual machines on Ampere Altra, and ultimately the Maia 100 AI accelerator and Cobalt server chip. This story is the opening data point of Microsoft's exit from an all-x86 server stack.
First-order effects
- Qualcomm and Cavium gain their first credible path into Windows servers, a market where x86 vendors have faced no architectural competition from within Microsoft's own OS.
- Azure operators running search and storage workloads get a second CPU architecture to build against, with Microsoft itself as the first customer validating the port.
Second-order effects
- Server software vendors must treat ARM Windows as a supported target rather than a curiosity, or risk losing Azure-hosted customers as Microsoft scales the preview fleet.
- The partnership model proves out and gets superseded: by 2022 Microsoft is offering ARM Azure VMs on Ampere Altra CPUs, widening the silicon supplier set beyond the original two partners.
Third-order effects
- If the pattern holds, hyperscale clouds stop being passive buyers of merchant x86 chips and become architects of their own silicon — the endpoint visible in Microsoft's in-house Maia and Cobalt designs, mirroring how the 2017 experiment normalized non-x86 servers in Azure.
The trend: Cloud providers are migrating from x86-only fleets toward ARM and eventually custom-designed server silicon, with Microsoft's 2017 Qualcomm-and-Cavium partnership as the first step of that arc.