Published 3 March 2026
Businesses often contact us with an application that still runs on Windows 10, Windows 7, or even Windows XP. It might still “work”, but there are usually hidden costs: security risk, instability, compatibility problems, and growing difficulty finding toolchains that can build for legacy operating systems.
Our recommendation: rebuild for Windows 11 or Linux, then migrate your data
For security and cost reasons, we strongly recommend building a modern replacement for Windows 11 or Linux and then exporting/migrating your data from the old system into the new one. In practice, this is often far cheaper than trying to keep an old platform alive.
Why legacy OS builds cost more
Building for older operating systems can require legacy languages, outdated compilers, and older dependencies. Even when it is possible, it can be difficult to test safely and reliably.
- Toolchain limitations: older OS targets may require older compilers or runtime components that are no longer supported.
- Testing challenges: we may not be able to properly test the build in-house, which can mean live testing on your machine.
- Higher risk during testing: compatibility work can be disruptive and may cause crashes while we validate behaviour on legacy systems.
- More time, more cost: the extra investigation and compatibility work usually costs more than a clean modern rebuild.
Data migration is usually the cheapest part
If your application stores data (for example a database, spreadsheets, exported files, customer records, or structured documents), we can usually export the data from the old system and migrate it into the new one. This approach keeps your business history and removes the legacy OS constraint.
Linux can reduce licensing costs
In many cases, Linux can be a cost-effective platform for custom business systems. Depending on your setup, you may avoid buying a new Windows licence, while gaining a stable and secure environment for databases, dashboards, automation tools, and internal workflows.
Legacy feasibility check: £150
If you specifically need a build for an older operating system, we can assess feasibility first. We charge £150 to determine whether a legacy build is realistically possible. If it is feasible, we will then provide:
- An estimate for the legacy build/patch route, and
- A comparable quote for a modern rebuild (Windows 11 or Linux) plus data export/migration.
Next step
If you're unsure which route is best, contact us with a short description of what the system does, what OS it currently runs on, and what data you need to keep. We'll recommend a practical next step.