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Windows Server 2016 reaches the end of its support on 12 January 2027. After that date, Microsoft stops releasing regular security updates for it. If a server in your office still runs 2016, whether it handles sign-ins, shared files, printing, Remote Desktop or your accounting software, now is the time to plan the move.

This guide sets out what changes, which options you have, and a step-by-step plan that fits around a working business.

What changes on 12 January 2027

The server will not stop working on that day. What stops is the flow of security fixes. Any weakness found after that date stays open, and attackers know which systems no longer get patched. Software vendors also tend to stop supporting their products on unsupported operating systems, so the next version of your ERP or antivirus may not install at all.

For businesses preparing for India’s DPDP Rules, an unsupported server that holds customer or staff data is also hard to justify as a “reasonable security safeguard”.

Step 1: Find every Windows Server 2016 system

Start with a simple list. Include physical servers and virtual machines, because a Hyper-V host may be on a newer version while the machines inside it still run 2016. For each one, note:

• what it does: Active Directory, DNS and DHCP, file and print, Remote Desktop, or a business application
• which applications and databases run on it, and who supports them
• how old the hardware is and when its warranty ends
• whether it also runs SQL Server 2016, which is already out of support

This list usually shows that a few servers matter a great deal and some can simply be retired.

Step 2: Choose the right path for each server

• In-place upgrade to a newer Windows Server version on the same machine. Quick, but only sensible when the hardware is recent and the applications support the new version.
• Clean install and migrate to Windows Server 2022 or 2025 on new or existing hardware. More work, but you start clean and leave old problems behind.
• Move to Azure, where Microsoft looks after the physical hardware. A good fit when hardware is due for replacement anyway or staff work from several locations.
• Retire it, when its job has moved elsewhere, for example file shares that now live in SharePoint or OneDrive.

Windows Server 2019 is still supported until 9 January 2029, but if you are replacing a server now, 2022 or 2025 gives you a much longer runway.

Step 3: Check your applications first

Most delays come from line-of-business software, not from Windows itself. Before you book any dates, ask each software vendor which Windows Server and SQL Server versions they support, and whether they need to be involved in the move. Their answer often decides the path for that server.

Step 4: Plan the move around your business

• Take a full backup before anything changes, and check that the backup job actually succeeded.
• Agree a window outside business hours, and a rollback plan if something does not work.
• Test sign-ins, file access, printing and each application with real users before you switch off the old server.
• Document what you set up, so the next person knows how it works.

If you cannot move in time

Sometimes an application vendor simply is not ready. In that case, look at Microsoft’s paid Extended Security Updates as a short-term bridge, and confirm the current terms with Microsoft. Treat it as extra time to finish the move, not as a reason to stay. In the meantime, limit what the old server can reach and who can sign in to it.

A realistic timeline

• This month: make the list of 2016 servers and ask your application vendors about support.
• Next 2–4 weeks: choose the path for each server and order any hardware or Azure services.
• Before 12 January 2027: move the critical servers first (sign-ins, files, the main business application), then the rest.

What’s new in Windows Server 2025

If you’re replacing a Windows Server 2016 machine, here’s what Windows Server 2025 brings that matters to smaller businesses:

• Hotpatching: install many security updates without a reboot, on servers connected to Azure Arc. Check the licensing terms.
• SMB over QUIC: secure file share access for remote staff without a VPN, now in Standard and Datacenter editions.
• Active Directory improvements: a new functional level, plus better security and scale.
• Hyper-V improvements: bigger virtual machines and GPU partitioning.

Not every feature fits every business, and some need extra licences. The upgrade decision should start with your applications and their vendor support.

The same applies to Windows 10 PCs

Windows 10 reached end of support in October 2025. Organisations not ready to move have been paying for Extended Security Updates, whose price doubles each year and is cumulative, so joining late means paying for earlier years too. The options are the same as for servers: upgrade to Windows 11 where the hardware allows, replace devices that can’t upgrade, or use ESU only as a short bridge. Running Windows 10 with no updates at all is one of the easiest ways in for attackers.