Microsoft has officially announced major changes to the Windows Update service that will take effect in 2027. A global rotation of security certificates will become a point of no return for countless devices worldwide. According to official notifications, old certificates ensuring secure connections between user PCs and update servers will lose their legal and technical validity in May and June 2027.
The Essence of Changes and the Threat to Outdated Systems
The primary risk is the loss of ability to receive any critical patches and new functional packages. For the vast majority of users of modern Windows versions, the update process is seamless — certificates are delivered along with regular cumulative updates. However, owners of devices that have been offline for extended periods or those running deeply outdated OS builds without current security libraries will face an inability to reconnect to Microsoft servers after the deadline.
Special Status of Windows 10 and ESU Risks
The most vulnerable category remains Windows 10 users. Since official support for this OS ended in October 2025, current security updates are available only to those who subscribed to the Extended Security Updates (ESU) program. If the system does not receive the necessary update packages, including new authorization files, by June 2027, it will be permanently excluded from Microsoft's security loop. This essentially turns the computer into a "digital island" cut off from vital security patches.
Conflicting Data
There is some discussion regarding whether Microsoft will offer "workarounds" for owners of critical industrial equipment running on legacy systems. While the corporate sector using local WSUS servers will receive automated infrastructure updates without direct administrative intervention, independent experts warn of potential difficulties with manual updates for isolated machinery or POS terminals that lack direct access to Windows Update.
What Users Should Do
To avoid disconnection, specialists recommend checking the OS status via built-in diagnostic tools and ensuring that the latest cumulative updates are installed correctly. For devices that do not update automatically, it is necessary to use the Microsoft Update Catalog for manual certificate installation. Ignoring this requirement will result in the device becoming irreversibly vulnerable to modern cyber threats after June 2027.
