Microsoft Engineer Clarifies Viral ‘Rust by 2030’ Chatter: A Research Migration Effort, Not a Windows Rewrite

A late-2025 LinkedIn post from a senior Microsoft engineer ignited a familiar internet storyline: a dramatic, decade-ending rewrite of Windows in a new programming language. The claim that spread fastest was simple and absolute—Microsoft would replace C and C++ with Rust by 2030.

But the engineer at the center of the discussion, Microsoft Distinguished Engineer Galen Hunt, later updated his post with a direct clarification: Windows is not being rewritten in Rust with AI, and the work he described is a research project aimed at making language-to-language migration possible at scale—not a new Windows product strategy.

The post that triggered the rumor

In an edited LinkedIn post, Hunt described an open role on his team—an in-person Principal Software Engineer position in Redmond—and framed it within a sweeping ambition. His stated goal was to ‘eliminate every line of C and C++ from Microsoft by 2030.’

He also outlined the core approach: combining AI and algorithms to rewrite Microsoft’s largest codebases, anchored by a quantitative target he called the team’s “North Star”: ‘1 engineer, 1 month, 1 million lines of code.’

Hunt’s post further described a technical foundation intended to make that scale plausible. He said the team has built “powerful code processing infrastructure,” including:

• Algorithmic infrastructure that creates a scalable graph over source code at scale.
• AI processing infrastructure that can apply AI agents, guided by algorithms, to make code modifications at scale.
• A claim that the core of this infrastructure is already operating at scale on problems such as code understanding.

Finally, the post specified a concrete demonstration target: the Principal Software Engineer role would help “evolve and augment” the infrastructure to enable translating Microsoft’s largest C and C++ systems to Rust. Hunt described Rust as the target language for the translation effort and emphasized that the job required production-quality, systems-level Rust experience (preferably at least three years), with compiler, database, or OS implementation experience considered highly desirable.

Those statements were widely reported and often reinterpreted as an imminent plan to rewrite Windows itself—a leap that prompted Hunt’s follow-up.

The clarification: research, not a Windows rewrite

Hunt’s update—added to the same LinkedIn post—was an explicit response to how broadly and confidently the original language was being read.

He wrote that the post generated “far more attention” than intended and that there was “speculative reading between the lines.” Then came the key point: “Windows is NOT being rewritten in Rust with AI.”

He continued: “My team’s project is a research project. We are building tech to make migration from language to language possible.”

Hunt also set boundaries around interpretation. He said the intent was to find like-minded engineers for the next stage of a multi-year endeavor, “not to set a new strategy for Windows 11+” and “not to imply that Rust is an endpoint.”

Multiple technology outlets subsequently framed the episode in similar terms: an ambitious internal effort described by a prominent engineer, followed by a clarification that it should not be mistaken for an official, company-wide Windows rewrite plan.

What Microsoft says it is building: code-migration infrastructure

In both the original and edited versions of the post, Hunt described the team’s mission in terms of scaling software transformation—not shipping a new consumer Windows written in a different language.

He placed the work within Microsoft’s AI-era engineering org structure, writing that the team is part of Microsoft CoreAI, within the EngHorizons organization, in the Future of Scalable Software Engineering group. The team’s mission, he said, is “to build capabilities to allow Microsoft and our customers to eliminate technical debt at scale.”

Taken together, the post characterizes the initiative as an attempt to make broad, systematic refactoring and migration more mechanizable:

• Source languages: C and C++
• Demonstration target language: Rust
• Method: AI agents guided by algorithms, operating on top of a code graph representation
• Output goal: operationalizing large-scale code changes at a pace far beyond conventional manual refactoring

Notably, Hunt’s clarification also underscores that Rust is not necessarily the final destination. The project is framed as enabling language migration in general, using Rust as the present target to validate the approach.

How the ‘Windows rewrite’ interpretation took hold

The rumor that Microsoft would rewrite Windows in Rust by 2030 proliferated quickly, in part because Hunt’s original phrasing was broad—“every line of C and C++ from Microsoft”—and because he explicitly referenced AI-assisted rewriting and massive scale.

Reporting in late December 2025 documented how the claim was amplified, then walked back. Outlets including InfoWorld and TechRadar emphasized the same core point as Hunt’s update: this is a research effort to automate language migration, not a confirmed plan to rewrite Windows in Rust.

German tech publication heise online also reported that the speculation reached the level where Microsoft communications leadership sought to contain it, noting that Microsoft’s Chief Communications Officer Frank X. Shaw spoke publicly in U.S. media to limit the rumor’s spread, alongside Hunt’s own clarification.

Rust is already appearing in parts of Microsoft’s stack

Even with the “Windows rewrite” rumor corrected, the episode landed amid a real, documented pattern: Microsoft has been steadily expanding Rust usage in security- and reliability-sensitive areas.

Windows drivers: toward safer abstractions

Microsoft’s Windows Driver Dev blog described efforts to make Rust more viable for Windows driver development. It notes that the open-source windows-drivers-rs project already provides building blocks for certain drivers, but that using it still requires writing significant amounts of unsafe Rust.

The blog outlines ongoing work to improve the developer experience and safety model, including:

• A push to expand windows-drivers-rs and create safe abstractions for kernel-mode structures and driver development interfaces.
• Collaboration between the Windows Driver Framework (WDF) team and Rust experts to design safe Rust abstractions for both kernel-mode (KMDF) and user-mode (UMDF) drivers.
• A goal of enabling more driver code to be written in safe Rust, reducing the amount of unsafe blocks required while preserving benefits such as strong type checking, zero-cost abstractions, and FFI compatibility.

Surface devices: shipping drivers written in Rust

Microsoft’s Surface IT Pro blog goes further, describing Rust not just as an experiment but as software shipping to customers. The post says Surface is embracing Rust to improve security and reliability and reports that Surface has shipped drivers written in Rust.

It also describes windows-drivers-rs as a Microsoft open-source project for enabling Windows driver development in Rust, and it lays out why Microsoft sees the shift as meaningful for security. The post contrasts the performance advantages of C and C++ with the lack of built-in protections against common pitfalls such as buffer overflows, null pointer dereferences, and race conditions—issues the post ties to the broader security conversation around memory safety.

Security firmware: Pluton’s Rust-based foundation

Microsoft has also discussed Rust usage in security-critical firmware. In a Windows IT Pro blog post on the Microsoft Pluton security processor, Microsoft says it chose Tock OS as a Rust-based foundation for Pluton firmware. The post notes that the Tock OS kernel is fully written in Rust and describes Pluton firmware architecture built atop that foundation.

Why Rust keeps coming up: memory safety and incremental adoption

Across Microsoft’s own published engineering posts, Rust is consistently framed as a tool for raising the security and reliability baseline, especially where software interacts closely with hardware or operates with elevated privileges.

In the Surface driver post, Microsoft explicitly describes Rust as a modern language “designed with memory safety at its core,” and argues that Rust’s ownership model and compile-time checks can help prevent classes of issues that historically surface in low-level code.

At the same time, Microsoft’s driver engineering post acknowledges practical tradeoffs: unsafe Rust remains a reality in today’s driver ecosystem, and Microsoft is investing in abstractions and interfaces meant to reduce unsafe usage and make Rust development more idiomatic.

This context matters when interpreting Hunt’s LinkedIn post. The claim that Microsoft could eliminate all C and C++ by 2030 reads like an endpoint; his update makes clear that it should be interpreted as a directional research goal tied to tooling and migration capability, not a binding product roadmap.

What remains unconfirmed—and what sources do not show

While Hunt’s post uses sweeping language—‘eliminate every line of C and C++ from Microsoft by 2030’—his own clarification simultaneously limits what can responsibly be inferred:

• There is no verified announcement in the cited sources that Microsoft has adopted a company-wide mandate to rewrite Windows in Rust.
• Hunt explicitly states that the work is not a new strategy for Windows 11+ and that Windows is not being rewritten in Rust with AI.
• Hunt’s framing emphasizes migration technology and research, with Rust used as a demonstration target, and he notes that Rust is not necessarily the endpoint.

Some reporting around the incident also discussed prior investments in Rust. However, among the sources reviewed here, the most concrete, primary disclosure is from the Rust Foundation itself: it announced that an unrestricted $1 million donation from Microsoft (made in December 2023) would be allocated over two years to support Rust ecosystem priorities, including infrastructure engineering and maintainer support.

A clearer picture of the 2030 claim

The fastest-spreading version of the story was that Microsoft intends to switch the Windows codebase from C/C++ to Rust by 2030. The more accurate, source-supported account is narrower and more specific:

Bottom line

Microsoft is demonstrably increasing Rust usage in areas where memory safety and reliability are central concerns—particularly in drivers and security firmware. But the “Rust by 2030” story that framed this as a Windows rewrite is not supported by the primary source at the center of the controversy.

Hunt’s own update is unambiguous: Windows is not being rewritten in Rust with AI, and the described work is a research project to build infrastructure for large-scale language migration. The episode highlights both the intensity of industry interest in memory-safe systems programming and the ease with which ambitious internal goals can be misread as a public product roadmap.