On 12 January 2027, Microsoft stops releasing security updates for Windows Server 2016. That date comes straight from Microsoft’s own lifecycle guidance, and it’s closer than it feels.
Your servers won’t switch off that day. That’s exactly the problem. Nothing dramatic happens, so it’s easy to put off. Meanwhile, every new vulnerability found after that date stays unpatched.
What End of Support Means
Mainstream support ended back in January 2022, so Server 2016 has only been getting security fixes for years. After January 2027, those stop too, across every edition including Datacenter, Essentials and Standard. Microsoft’s advice is to move to Windows Server 2025.
It’s also worth checking the products that sit around the server. Some related Microsoft software, such as .NET Framework 4.6.2, reaches end of support on the same date.
Why Waiting Is Risky
Unpatched servers are an easy target. There’s a compliance angle too. If your business is in scope for NIS2, which has applied in Germany since 6 December 2025, running unsupported systems is hard to defend in a risk assessment.
Migration Takes Longer Than You Think
Moving a server is rarely just installing a newer operating system. Older applications may not run on it. Licences, backups, monitoring and integrations all need checking. Starting in January for a January deadline is a recipe for stress.
A Sensible Order of Work
- Find every Windows Server 2016 machine, including the forgotten ones
- Check which applications run on them and whether the vendors support newer versions
- Decide for each one: upgrade, move to the cloud or retire
- Back everything up before you touch anything
- If you can’t finish in time, ask about paid Extended Security Updates as a short-term bridge, and check the current terms
That last step is a stopgap, not a plan.
Last month’s post asked whether your infrastructure is ready for what comes next. This is a very concrete version of that question.
Not sure what’s running in your environment?
Digitus Consulting can help you find out and plan a sensible migration. Contact the team to get started.
