According to The Register's report on December 24, 2025, Microsoft is advancing a wide‑ranging code migration plan that aims to replace existing C and C++ implementations with Rust "where feasible," with 2030 listed as a possible completion date.
The report says Microsoft is turning to Rust primarily to address memory‑safety issues: Rust's ownership model and borrow checker can prevent common vulnerabilities such as buffer overflows and null pointer dereferences at compile time, which is especially important for operating systems, network stacks and various system‑level services. Microsoft's internal assessments conclude that rewriting security‑critical code in Rust could significantly reduce vulnerability introduction and later patching costs.
On the technical path, the article emphasizes Microsoft will not simply "abandon and rewrite everything." The company plans a layered, phased migration: start with high‑risk modules with many historical vulnerabilities and wide exposure, then apply AI to assist in translating large amounts of repetitive or patterned C/C++ code. AI will play three roles—initial automated translation to produce Rust drafts, automated generation of unit and regression tests, and suggesting fixes during human review. The report notes that, combined with existing fuzzing and static‑analysis pipelines, AI‑generated code will be strictly validated before being merged into mainline branches.
Scale is the most immediate challenge. Microsoft's vast codebase spans kernels, drivers, cloud services and client applications, with C/C++ code potentially counting in the billions of lines. The report quotes internal views that this is not a short‑term project and requires extensive coordination on build systems, dependency management, binary compatibility, foreign function interfaces (FFI) and performance benchmarking. For example, some extremely performance‑sensitive kernel or driver sections will in the short term still require critical parts written in C/C++; any migration must ensure latency, throughput and resource usage are not degraded.
Another detail is talent and training: Microsoft is expanding recruitment of Rust engineers and providing Rust training and migration tools for existing C/C++ developers. The report also says Microsoft will run pilot projects to validate methodologies first on Azure, certain system components and security‑critical services, then gradually scale to more repositories. Microsoft plans to engage with the Rust community and open‑source projects to avoid duplicating effort and to share migration toolchain成果.
Security and compliance arguments are repeatedly cited: the potential to reduce memory vulnerabilities is the core commercial rationale, but substantial resources are needed to ensure behavioral consistency and no regressions after migration. The report illustrates an AI–human review loop: AI translates and generates candidate implementations → automated testing and fuzzing surface issues → human engineers rewrite and optimize complex edge cases and performance hotspots.
Finally, The Register concluded on December 24, 2025 that Microsoft's goal is both pragmatic and ambitious: pragmatic in that the company will not pursue a blind, one‑size‑fits‑all approach but treat Rust as a long‑term route to improved security; ambitious in that, if executed as planned, it could become a model case of company‑scale code‑security transformation and may encourage other firms to adopt Rust and AI‑based migration toolchains.
For IT developers and security researchers, this move implies many practical opportunities in coming years around language migration, AI‑assisted code generation and system security verification, and may reshape development and maintenance processes for large software projects.
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