Two in five devices still use Windows 10 as support nears end
A significant proportion of devices in Australia and globally continue to operate on Windows 10 as the operating system approaches its end-of-life, according to new research by TeamViewer.
The analysis, which examined 250 million anonymised TeamViewer sessions conducted between July and September 2025, found that more than 40% of global endpoints receiving support through TeamViewer were still running Windows 10. In Australia, this figure stood at 38% for supported endpoints accessed via TeamViewer during the same period, slightly below the global average but still representing a large number of devices potentially at risk.
The reliance on Windows 10 poses critical cybersecurity and operational concerns ahead of the cessation of Microsoft's support for the operating system, which is scheduled for mid-October. After this date, Windows 10 will no longer receive security patches or updates, leaving remaining users vulnerable to emerging threats.
Jan Bee, Chief Information Security Officer at TeamViewer, highlighted the urgency for organisations and individuals to act on this transition.
"In a few days, two in five endpoints will no longer receive patches and updates, leaving them exposed to vulnerabilities. Companies and individuals need to upgrade to a newer, supported operating system as soon as possible. Keeping your systems up to date is one of the most effective ways to protect individuals and businesses against cybersecurity threats."
The analysis included both paid and free TeamViewer license users and reviewed the endpoint-the device receiving support-during the sessions. The globally consistent figures suggest the continued prevalence of Windows 10 across a broad spectrum of environments, not limited to any single region.
Upgrade obstacles
For businesses, migrating large fleets of devices to a supported operating system presents logistical and resource challenges. Upgrading involves assessing device compatibility with Windows 11, evaluating hardware requirements such as processor generation, Trusted Platform Module (TPM) configuration, and Secure Boot support, as well as ensuring post-migration compliance and functionality.
To address these difficulties, TeamViewer has developed its Digital Employee Experience (DEX) solution, which includes a Windows 11 Readiness Pack designed to simplify and manage the migration process. DEX provides IT teams with a real-time, comprehensive overview of a company's device landscape, identifying readiness for upgrade as well as highlighting endpoints needing remediation or replacement.
The suite also incorporates validation checks after upgrades, confirming configuration integrity and compliance, which assists organisations in completing a smooth transition to the new operating system while minimising downtime and risk.
Adrian Todd, Vice President Product Management at TeamViewer, described the benefits of this approach for IT teams managing complex migrations.
"Our solution gives IT teams the clarity they need on which devices are ready to upgrade, where issues are, and confidence that everything is compliant once the upgrade is complete."
Cybersecurity implications
The end of Windows 10 support is particularly significant amid increasing concerns around digital vulnerability and cyberattacks. Unsupported operating systems are often singled out by malicious actors, as the lack of ongoing security updates provides a pathway for exploitation.
With devices running Windows 10 soon to be excluded from new patches and updates, both businesses and private users are being advised to migrate in order to maintain adequate cybersecurity defences. TeamViewer's data indicates that the issue is widespread, affecting a considerable proportion of endpoints worldwide, regardless of industry or geography.
Organisations are expected to expedite their upgrade plans in the weeks ahead as the deadline nears, utilising tools such as TeamViewer DEX to orchestrate migrations efficiently and with minimal operational disruption.
