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Windows Server 2016 End of Support – What You Need to Know

Windows Server 2016 will reach end of extended support in January 2027; after this date Microsoft will no longer provide security updates, patches or technical support for this platform.What does this mean?Once support ends, newly discovered vulnerabilities will not be patched and over time, systems running Windows Server 2016 will become increasingly exposed to security risks. Furthermore, vendor support will no longer be available meaning we will not be able to rely on Microsoft assistance for issue resolution, it will instead become a best‑endeavours exercise. In a world where ransomware attacks and phishing attempts continue to rise, unsupported systems become an attractive target for attackers.

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Why it matters

Continuing to run an unsupported operating system can lead to:

–        Increased exposure to cyber threats across your network, exploits can provide hackers with the opportunity to move laterally through the network to cause further damage and disruption

–        Potential complications with cyber insurance policies

–        Compliance challenges for standards such as Cyber Essentials and ISO certifications

–        The cost of doing nothing can be significant, with the potential for an escalating financial impact, reputational damage and unplanned downtime

–        Line‑of‑business application compatibility may depend on the underlying operating system being supported

What are your options?

To stay secure and compliant, businesses should start planning now.  The main routes are:

–        Upgrade to a supported version of Windows Server (2019 or later), this ensures ongoing security updates and full vendor support. Depending on your environment, licensing requirements and hardware suitability may need to be reviewed as part of the upgrade.

–        Migrate to a cloud‑based solution – this could involve moving workloads to platforms such as Microsoft Azure or adopting a Software‑as‑a‑Service (SaaS) alternative, removing the need to manage on‑premise infrastructure. This approach can improve scalability, resilience and reduce ongoing management overhead.

–        Microsoft Extended Security Updates (ESU) – this provides access to critical security patches for a limited time after end of support. However, this is a usually a costly option and is generally considered a short‑term, last‑resort measure rather than a long‑term strategy.

Start planning early

Server upgrades and migrations are not quick or straightforward changes, they require careful planning and coordination to avoid disruption to the business. Typically, this includes a detailed assessment of existing hardware to confirm suitability for newer operating systems, as well as thorough application compatibility checks to ensure critical systems will continue to function as expected. Environments often need to be built and tested in advance, allowing any issues to be identified and resolved before going live. In addition, there is usually a need to plan and manage periods of downtime, with clear scheduling and communication to minimise impact on users and business operations.

How we can help

We work with businesses to assess their current environments and define the most suitable path forward. Whether that’s upgrading your servers or transitioning to the cloud, we’ll help you plan and deliver it smoothly. If you’re currently running Windows Server 2016, now is the time to review your next steps. Get in touch today!

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