Windows Server 2016 End of Support: What Your Business Needs to Know

On 12 January 2027, Microsoft ends extended support for Windows Server 2016. If your business still runs a server on it, and plenty of small businesses do, that date matters. The server won’t switch itself off, but it will stop receiving the security updates that keep it safe to use.

Here’s what end of support actually means, how to check whether it affects you, and the realistic options for what to do next.

What “End of Support” Actually Means

Windows Server 2016 has been on borrowed time for a while. Its mainstream support ended in January 2022, which meant no new features or general fixes, only security updates. On 12 January 2027 those security updates stop too.

From then on, any new security weakness found in Windows Server 2016 will stay open. Attackers know this, and unsupported systems are exactly what they look for. Your server will keep running as normal, which is part of the danger: nothing obvious changes, but it becomes steadily easier to break into.

Does It Affect You?

It affects every edition of Windows Server 2016, including Standard, Datacenter and Essentials, and everything running on it. In a typical small business, that server might be handling:

• Staff logins and user accounts
• Shared files and folders
• Printing
• Accounts, practice management or other line-of-business software
• Remote access for people working from home

To check which version you’re running, log on to the server, press the Windows key and R together, type winver and press Enter. If it says Windows Server 2016, this applies to you. If you’re not sure where your server is or who looks after it, that’s worth finding out now too.

It’s Not Just a Security Issue

Running unsupported software causes knock-on problems beyond the risk of an attack. Cyber Essentials requires the software you use to be supported and kept up to date, so an unsupported server can cost you your certification at renewal. Our guide to Cyber Essentials renewal covers what assessors look for. It’s also worth checking your cyber insurance policy, as some insurers expect systems to be supported.

Software suppliers tend to follow Microsoft’s lead as well, so the applications on your server may stop being supported on it before long.

Your Options

Upgrade to a newer version of Windows Server. If the hardware is up to it, the server can often be upgraded to Windows Server 2022 or 2025. The work is usually less in the upgrade itself and more in checking that your applications run properly afterwards.

Replace the server. A server bought when Windows Server 2016 was current is likely to be getting on, so it may make more sense to replace the hardware and the operating system together. Our article on that server under the desk helps you work out what it’s really doing.

Move to the cloud. For many small businesses, the server’s jobs can move elsewhere entirely: files to SharePoint and OneDrive, logins to Microsoft 365, and applications to hosted versions. That can mean no server to look after at all. Our cloud services page explains how that works.

Consolidate. If you have several older servers, January is a good moment to reduce how many you need. Our server consolidation planning service covers this.

Buy time with Extended Security Updates. Microsoft offers paid Extended Security Updates for up to three years for businesses that can’t move in time. They cost money and are meant as a bridge while you finish a migration, not as a long-term plan.

Don’t Leave It Until January

Migrations take longer than people expect, mainly because of testing the software that runs on the server. Starting now gives you time to plan, test and move at a quiet moment rather than in a rush. It’s also worth knowing that January 2027 brings another deadline: the UK phone network switch-off on 31 January, so it makes sense to plan both together.

Where CCSW Comes In

We help businesses across South Wales and the UK move off Windows Server 2016 with as little disruption as possible, whether that means upgrading, replacing or moving to the cloud. We’ll start by checking what your server actually does, then recommend the most sensible route rather than the most expensive one. Find out more about our desktop and server support, or get in touch and we’ll take a look.