Microsoft will stop providing security updates for Windows Server 2016 on 12 January 2027, less than three months from now. Your server will not stop working that day. The risk builds quietly: new vulnerabilities stop being patched, and an unpatched server that holds your files, user accounts or business applications becomes a growing exposure. If you still run Windows Server 2016, decide what happens to it now rather than in the week it expires.
What “end of support” means
- Microsoft stops releasing security updates for the product, unless you buy extended updates.
- Technical support and fixes from Microsoft also end.
- The server keeps running, but software vendors, auditors and insurers may expect supported systems.
Step 1: Find every Windows Server 2016 system
There is often more than one, and not only the obvious file server. Easily forgotten examples are virtual machines, a server running accounting software, a machine hosting door access or CCTV software, and a server at a branch office.
To check a server’s version, open Command Prompt on it and run:
systeminfo | findstr /B /C:"OS Name"
Also check the applications on each server. Their support dates are separate: SQL Server 2016 reached end of support in July 2026, and Exchange Server 2016 in 2025.
Step 2: Know what each server does
Write down its roles (file sharing, user accounts, DHCP/DNS, printing), who depends on it, and which business software runs on it. Application compatibility is usually what takes longest, so find out early.
Step 3: Confirm your backups before changing anything
Start any upgrade or migration with a verified backup and a restore test, not just a “backup successful” message. A migration is the moment backup problems show up.
Step 4: Choose a route
- Upgrade to a newer Windows Server (2022 or 2025). This can be done in place or by moving to a new server or virtual machine. In-place upgrades can suit simple setups, while older servers that have collected years of settings are often better migrated cleanly. Windows Server 2019 only buys about two more years (support runs to 2029, against 2031 for 2022 and 2034 for 2025), so it is rarely the right target.
- Move workloads to the cloud. File shares can move to SharePoint and OneDrive, mail to Microsoft 365, and applications to Microsoft Azure or a private cloud in a data center. The old server can then be retired. Our Cloud & Data Migration service covers this, and you can read how we handled an Exchange 2010 to Microsoft 365 migration and a legacy server upgrade.
- Buy Extended Security Updates as a temporary bridge. Microsoft offers paid updates for up to three years if you cannot move in time. This buys time, not a solution, and costs add up each year. Check pricing and setup requirements with Microsoft or your licensing partner.
- Retire it. If another system has replaced the server’s role, shut it down properly rather than leaving it online and unpatched.
Step 5: Plan around the calendar
Year-end is busy and January changes are harder, because staff are away and business closes its books. Start early and leave a buffer so the deadline isn’t setting your schedule. Simple file and user setups move faster, while business applications need testing time.
How Topone can help
We help Hong Kong businesses review their server environment, choose between upgrade, cloud and extended updates, and verify backups before any change. If you aren’t sure what you’re running, or want a second opinion on the best route, contact us.
Source: Microsoft, Planning ahead for Windows Server 2016 end of support.