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Microsoft has announced the end of support for certain versions of Windows 11 and Office 2021, a decision that will transform how IT services manage their parks. For companies, it is not just about updating licenses: security, software compatibility, and operational continuity can be affected.
Even if some organizations consider the end of support as a simple warning, the consequences can be significant if not anticipated.
When Windows 11 reaches its end of support, security updates are no longer distributed by Microsoft. This means that new vulnerabilities discovered in the system will not be fixed.
For companies, this represents a direct risk of cyberattack. Unupdated workstations become more vulnerable to malware, ransomware, and intrusions, which can lead to costly service interruptions.
Many business applications depend on Windows updates to function properly. After the end of support, some applications may experience malfunctions or refuse to run.
IT parks must therefore test critical software on supported versions or plan a migration to compatible alternatives to avoid operational interruptions.
Office 2021 will stop receiving security fixes and functional updates. Documents stored on unsecured versions could be exposed to vulnerabilities.
Collaborative tools like Outlook, Teams, or Excel may lose some features if cloud services evolve and are no longer compatible with Office 2021. In some companies, this can lead to compatibility issues in file exchanges or meeting scheduling.
Before any action, it is necessary to conduct a precise inventory:
• Identify machines still running obsolete Windows 11 or Office 2021
• Check licenses and exact installed versions
• List business software and its compatibility with new versions
This step allows to prioritize updates according to critical workstations and uses.
Microsoft offers alternatives: supported version of Windows 11 or Microsoft 365 to replace Office 2021. A well-planned migration includes:
• A schedule to gradually update machines
• Compatibility tests for business software
• Communication to users about changes and new features
These actions limit disruptions and interruptions in the company.
Without updates, systems become a prime target for hackers. A vulnerable workstation can allow access to sensitive or confidential data, and ransomware can paralyze a complete service.
Business applications may malfunction or no longer be supported, generating interruptions and productivity losses. IT teams will then have to intervene urgently, which increases operational load and stress.
For companies subject to standards like ISO 27001 or GDPR, using unsupported systems can lead to non-compliance and sanctions. It becomes crucial to plan the update to stay aligned with legal requirements.
If some machines cannot be updated immediately, they can be isolated in specific network segments to reduce the risk of intrusion.
Virtualization allows running old applications in a secure environment. This allows to continue using Office 2021 for some specific uses while minimizing risks for the rest of the IT park.
Even after the end of support, monitoring tools can detect intrusion attempts or anomalies. IT teams can then intervene quickly before the vulnerability is exploited.