Microsoft wants to remove every line of C and C++ from its vast codebase and replace it with Rust by the year 2030. This is not a small refactor or a single product update. This is a deep, structural change that could redefine how large-scale software is built and maintained for decades to come.
The size of Microsoft’s codebase makes this goal almost unbelievable
Microsoft products power operating systems, cloud platforms, enterprise tools, and developer ecosystems used by billions of people. Behind that are millions, possibly billions, of lines of legacy C and C++ code written over decades. Rewriting that is like changing the engine of a flying airplane without crashing it.
The announcement came directly from a senior Microsoft engineer
Galen Hunt, a Distinguished Engineer at Microsoft, shared this goal openly on LinkedIn. His message was clear and bold. He wants to eliminate all C and C++ code at Microsoft by 2030, and he believes it is achievable with the right mix of AI, algorithms, and engineering discipline.
The 2030 vision is ambitious but carefully framed
This is not about rushing or breaking things. The idea is to steadily modernize systems while maintaining stability. The timeline gives Microsoft years to experiment, validate tools, and apply lessons learned across teams and products.
C and C++ have served well, but they come with serious risks
C and C++ give developers a lot of power, but that power comes with responsibility. Manual memory management can lead to bugs like buffer overflows and use-after-free errors. These issues are not just bugs, they are security vulnerabilities that attackers actively exploit.
Technical debt has become a silent productivity killer
Old code is expensive to maintain. Every workaround added over the years slows innovation. Microsoft sees this migration as a way to pay down technical debt and free engineers to focus on new ideas instead of fighting old problems.
Rust offers a safer foundation for modern software
Rust is designed to prevent entire classes of memory-related bugs at compile time. It does this without a garbage collector, which means it still delivers high performance. In simple terms, Rust forces developers to write safer code by default.
Governments and security experts are pushing memory-safe languages
In recent years, governments and cybersecurity agencies have recommended moving away from unsafe languages. Rust often tops that list. Microsoft aligning with this trend shows it is thinking not just about performance, but also about long-term security trust.
Artificial intelligence plays a central role in this transformation
Microsoft is not expecting engineers to manually rewrite millions of lines of code. Instead, it is building AI-driven systems that understand, analyze, and transform code automatically, guided by carefully designed algorithms.
One engineer, one month, one million lines is the guiding star
This phrase shared by Hunt explains the efficiency Microsoft is aiming for. It sets a measurable goal for productivity and shows confidence in the internal tools being built to support this effort.
Microsoft has already built large-scale code processing systems
According to Hunt, the company now has infrastructure that creates massive graphs over source code. These graphs help AI systems understand relationships, dependencies, and behaviors across huge codebases.
AI agents are guided, not left alone
This is not about letting AI randomly rewrite code. Algorithms guide AI agents so changes are intentional, verifiable, and scalable. This hybrid approach reduces risk and increases confidence in the output.
A dedicated internal group is leading this mission
The Future of Scalable Software Engineering group is responsible for building these tools. Their mission is simple but powerful: eliminate technical debt at scale, both inside Microsoft and eventually across the industry.
This team works like an internal innovation lab
They test ideas with internal customers first, refine the tools, and then help other product groups adopt them. This reduces disruption while encouraging consistent progress.
Many people assumed Windows would be fully rewritten overnight
After the LinkedIn post went viral, headlines suggested Windows itself would be rewritten in Rust using AI. This caused confusion and concern, especially among users and developers.
Microsoft quickly clarified the misunderstanding
Hunt later explained that Windows is not being fully rewritten right now. The focus is on research and tooling that makes language migration possible, not on suddenly replacing entire operating systems.
Rust is already being used in Windows development
Microsoft has enabled developers to write Windows drivers in Rust. This is a major step because drivers operate at low levels where safety and stability matter most.
Azure has already gone Rust-first for new projects
Back in 2022, Azure’s CTO announced that Rust should be the default language for new systems-level projects. This shows the company has been moving in this direction for years.
Migrating massive systems is never easy
Automation will not catch everything. Edge cases, unusual dependencies, and undocumented behaviors will surface. These challenges are expected, and Microsoft is planning for them.
Human engineers remain essential to the process
AI can accelerate work, but experienced engineers are still needed to review, validate, and guide decisions. This is augmentation, not replacement.
Microsoft is hiring engineers to make this vision real
The company is looking for a Principal Software Engineer to help build and evolve these translation tools. This role sits at the heart of the transformation.
Deep Rust experience is a key requirement
Candidates are expected to have years of experience writing systems-level Rust code. Backgrounds in compilers, operating systems, or databases are highly valued.
The job comes with strong compensation and expectations
The role requires working from Microsoft’s Redmond office three days a week. Salaries range from around $139,900 to $274,800 per year, reflecting the importance of the position.
This move could reshape the software industry
If Microsoft succeeds, other large companies may follow. This could accelerate the decline of unsafe legacy languages and redefine best practices in systems programming.
Developers may need to rethink their career paths
Rust skills are becoming more valuable. Engineers who invest time in learning Rust now may find themselves in high demand over the next decade.
Media reports sometimes exaggerate, but the core idea stands
While some headlines overstated the scope, the underlying effort is real. Microsoft is serious about safer, more maintainable software.
Rust is not the final destination
Microsoft leaders have made it clear that Rust is not an endpoint. The real goal is building technology that makes future language migrations easier, whatever those languages may be.
This is about long-term resilience, not short-term hype
By focusing on tooling, automation, and scalability, Microsoft is preparing for a future where software evolution is continuous and less painful.
The next decade could define Microsoft’s engineering legacy
If successful, this initiative will be remembered as one of the most ambitious modernization efforts in tech history, setting a new standard for how large software systems evolve.
Conclusion
Microsoft’s plan to replace C and C++ with Rust by 2030 is not just a language switch. It is a statement about the future of secure, scalable, and maintainable software. By combining AI, algorithms, and human expertise, Microsoft is attempting something that once seemed impossible. Whether or not every line is replaced by 2030, the direction is clear, and the impact will be felt far beyond Microsoft itself.
FAQs
Is Microsoft really removing all C and C++ code by 2030
That is the stated goal, but it is a long-term vision rather than a guaranteed deadline.
Is Windows being completely rewritten in Rust
No, Microsoft clarified that Windows is not being fully rewritten at this time.
Why is Rust preferred over C and C++
Rust offers built-in memory safety, reducing common security vulnerabilities.
 Will AI replace software engineers at Microsoft
No, AI is being used to assist engineers, not replace them.
What does this mean for developers outside Microsoft
Rust skills will likely become more valuable as more companies prioritize memory-safe languages.
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Zeeshan Ali Shah is a professional blog writer at AliTech Solutions, and Realancer renowned for crafting engaging and informative content. He holds a degree from the University of Sindh, where he honed his expertise in technology. With a keen eye for detail and a passion for staying up-to-date on the latest tech trends, Zeeshan’s writing provides valuable insights to his readers. His expertise in the tech industry makes him a sought-after writer, and his work at AliTech Solutions has earned him a reputation as a trusted and knowledgeable voice in the field.
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