Nine in ten UK firms face cyber risks from Windows technical debt

Nine in ten organisations are dealing with Microsoft Windows technical debt from legacy IT systems, leaving them exposed to potential cyber risks as the Windows 10 end of life draws nearer.

Cloudhouse has released its inaugural State of Technical Debt report, highlighting the extent to which legacy Windows and Linux systems continue to persist within UK organisations. The report is based on responses from 250 chief information officers, risk and compliance managers, and IT leaders.

Prevalence and risks

The report found that 90% of organisations are carrying technical debt related to Windows, with only 10% free from such liabilities. Similarly, just 31% of organisations do not carry Linux technical debt.

A key finding is that 72% of respondents believe outdated Windows systems expose them to a greater risk of cyberattacks. System downtime is another significant issue: 51% of organisations have experienced downtime they attribute directly to technical debt.

Compliance remains a challenge, with 48% of organisations facing issues with audits due to legacy systems. Additionally, 41% said regulatory compliance has become harder to maintain because of continued reliance on outdated Windows environments.

Approaches to technical debt

While awareness of the risks is high, proactive action remains limited. The research indicates that only 14% of organisations are actively investing in solutions to fix legacy IT. Nearly half (46%) reported that they only address technical debt when breakdowns or failures occur. Just 39% have established a clear, funded roadmap for eliminating technical debt from their IT estates.

As the Windows 10 end of life deadline approaches, the risk to operational and data security from outdated systems is becoming more acute. Migrating or modernising older applications emerged as a particular concern, with 46% highlighting it as a significant challenge in their organisation.

Impact on innovation and budgets

Technical debt is not only a technology challenge, but also a resource and organisational issue. Nearly half of the surveyed organisations (45%) noted that budgets initially allocated for innovation are now being diverted to maintain legacy systems.

One in three (31%) believe that Windows technical debt actively prevents innovation efforts within their organisation. Furthermore, 35% stated it contributes to employee burnout or stress, while 34% indicated it has led to higher staff turnover.

Barriers to cloud adoption

Legacy systems are also cited as an obstacle to wider digital transformation goals. Almost half (45%) of respondents said Windows technical debt limits their organisation's capacity to move to the cloud or to pursue digital change initiatives.

Technical debt isn't just a tech problem, it's a business risk, a security gap, and a human cost. The fact that 90% of organisations are still carrying Windows technical debt, so close to the end of life of Windows 10, should be a wake-up call. Awareness is high, but action lags far behind. Unless organisations address this now, the costs - in downtime, compliance failures, lost innovation, and employee wellbeing - will only increase.

The State of Technical Debt report outlines the current landscape as organisations assess and plan their transition away from reliance on outdated operating systems and infrastructure.