Microsoft and AT&T say the carrier will run core parts of its 5G network on Azure; AT&T's newer networks rely more heavily on virtualization than hardware
Stephen Nellis / Reuters :
Context & Ripple Effects
This deal completes an arc Microsoft has been building since it bought Affirmed Networks in March 2020 — the virtualized, cloud-native 5G core vendor whose technology is exactly what lets carrier workloads run off-premises. The relationship itself predates that: back in 2019 AT&T signed a multi-year, non-exclusive deal worth a reported $2B+ to put its 250,000 staff on Azure and Office 365, which made Microsoft an enterprise IT vendor to AT&T before it became a network infrastructure one.
The headline shift is scope, not novelty: moving from office productivity to core parts of the 5G network itself, riding AT&T's stated reliance on virtualization over dedicated hardware. Verizon had already pulled Microsoft into its network plans via a private 5G edge compute solution built on Azure Stack Edge, meaning both major US carriers named in this coverage now run Azure inside their network strategies.
First-order effects
- AT&T converts what would be capital-intensive core network builds into Azure-hosted workloads, while Microsoft lands carrier-grade 5G traffic as a new anchor class of Azure customer beyond enterprise IT.
Second-order effects
- Verizon's existing Azure edge arrangement shows rivals responding by partnering rather than fighting — pushing every major US carrier toward picking a hyperscaler ally, and pressuring laggards to virtualize their cores or cede cost ground.
Third-order effects
- If core-network-on-cloud becomes standard, the telecom industry splits between carriers that own software-defined networks rented from cloud platforms and those still tied to proprietary hardware stacks — echoing the earlier Cisco-Microsoft attempt to bridge Azure and physical networking gear.
The trend: Carrier networks are migrating from dedicated hardware onto hyperscaler clouds, with Microsoft using acquisitions like Affirmed Networks to make Azure a 5G core substrate.