Windows Server 2016 end of support: the date in Microsoft's words, and a checklist for a small office

The end date, as Microsoft states it

Source: Microsoft Learn, Microsoft Lifecycle, "Windows Server 2016". Read 25 October 2026.

• "Windows Server 2016 follows the Fixed Lifecycle Policy."
• "This applies to the following editions: Datacenter, Essentials, MultiPoint Premium, Standard"
• "Support dates are shown in the Pacific Time Zone (PT) - Redmond, WA, USA."
• Extended End Date: "1/13/2027 6:59:59 AM"
• Mainstream End Date: "1/12/2022 6:59:59 AM"

In plain words (ours): Microsoft writes the date month first, so "1/13/2027 6:59:59 AM" is 13 January 2027 at one second before 7:00 am Pacific Time. In January the Pacific zone is eight hours behind the UK, so that moment is 2:59:59 pm UK time on 13 January 2027. Microsoft states the end as that exact moment; we have not rounded it to a day. Microsoft's announcement of Extended Security Updates and its Essentials page, both quoted below, write the same end as "January 12, 2027".

If you run Windows Server 2016 Essentials, read this first

In plain words (ours): Extended Security Updates are not an option for the Essentials edition. Microsoft says so in the quotes below. If your server is Essentials, your choices are to upgrade or to migrate, and the same end date applies.

Source: Microsoft Support, "Windows Server 2016 Essentials end of support". Read 25 October 2026.

• "Support for Windows Server 2016 Essentials ends on January 12, 2027."
• "Extended Security Updates (ESU) are not available for Windows Server 2016 Essentials."
• "ESU offerings for Windows Server 2016 apply only to Windows Server 2016 Standard and Datacenter editions and do not extend support for Windows Server 2016 Essentials."
• "Customers running Windows Server 2016 Essentials should complete their migration to a supported platform before support ends on January 12, 2027."
• "Windows Server 2016 Essentials is the last version that includes the full classic Windows Server Essentials experience."
• "Microsoft support for Remote Web Access and remotewebaccess.com as part of Windows Server 2016 Essentials ends on January 12, 2027."

A checklist for a small office running Windows Server 2016

1. Write the date down: 13 January 2027, 2:59:59 pm UK time, from the quote above.
2. List every server on Windows Server 2016, its edition (Standard, Datacenter or Essentials) and what each one does (file shares, domain controller, an application, a database). The options below are chosen per server, not once for the office.
3. For each server, pick one of the three options below: upgrade in place, build new and migrate, or Extended Security Updates if the edition and the licence allow it (Microsoft says not for Essentials).
4. Check the licence before you upgrade, in Microsoft's words below.
5. Back up first, in Microsoft's words below.

The options, in Microsoft's words

Upgrade or migrate

Source: Microsoft Learn, "Plan Your Windows Server Upgrade Path". Read 25 October 2026.

• "Windows Server supports several methods for moving to a newer version, including in-place upgrade, clean install, migration, cluster rolling upgrade, and edition conversion."
• In-place upgrade: "Installs a newer version of Windows Server over the existing one, keeping your settings, server roles, features, and data."
• Clean install: "Installs Windows Server on a new server or overwrites the existing OS."
• Migration: "Moves roles or features from a source server to a different destination server running Windows Server."
• "Starting with Windows Server 2025, nonclustered systems can upgrade up to four versions at a time."
• "For Windows Server 2022 and earlier, nonclustered systems can upgrade up to two versions at a time."
• "Not all roles support in-place upgrade."
• "Always back up your system and important files before performing an in-place upgrade, clean install, or migration to a later version of Windows Server."
• On licensing: "Before you upgrade, ensure you have a valid product key and activation method for the target version. Unlike Windows client, each Windows Server upgrade requires a separate license."

In plain words (ours): the same page's table of supported in-place upgrade paths by installation media shows the row for Windows Server 2016 with "Yes" under Windows Server 2019, Windows Server 2022 and Windows Server 2025, and "No" under Windows Server 2012 R2 and Windows Server 2016. Check that table yourself on the day you decide; it is Microsoft's to change.

Extended Security Updates (ESU)

Source: Microsoft Windows Server Blog, "Planning ahead for Windows Server 2016 end of support", dated February 25, 2026. Read 25 October 2026.

• "In accordance with the Microsoft Lifecycle Policy, extended support for Windows Server 2016 will end on January 12, 2027."
• "Today, we are announcing Extended Security Updates for Windows Server 2016."
• "Extended Security Updates for Windows Server 2016 deliver an enhanced cloud experience through Azure Arc. Security updates are available through the Azure portal, providing a streamlined, customer-centric way to protect on-premises and multi-cloud environments."
• "While this provides an option to continue running Windows Server 2016 to avoid any disruption to business-critical applications, this period also presents the opportunity to upgrade to Windows Server 2025 or consider migrating to Azure."

Source: Microsoft Tech Community, Azure Arc Blog, "Generally Available: Windows Server 2016 Extended Security Updates enabled by Azure Arc". Read 25 October 2026.

• "Today, the Azure Arc team is pleased to announce that Extended Security Updates (ESUs) enabled by Azure Arc is now generally available for Windows Server 2016."
• "By connecting your Windows Server 2016 machines to Azure Arc-enabled servers, you can enroll in ESUs and receive security updates."
• "Extended Security Updates give you access to Critical and Important security updates for Windows Server 2016 for up to three years after end of support, covering January 12, 2027 through January 2030."
• "They provide a supported bridge for business-critical applications that need more time to migrate, without new features or non-security fixes, and without leaving systems exposed while you plan your move."
• "Extended Security Updates support the Standard and Datacenter editions of Windows Server 2016 and generally require Software Assurance through a Volume Licensing program (machines licensed through SPLA or a Server Subscription do not)."
• "Pay-as-you-go billing means a monthly subscription you can stop when a server is migrated or decommissioned, so you only pay for the coverage you use."
• "Keyless delivery removes the need to acquire, install, or activate keys on each server."

Source: Microsoft Support, "Windows Server 2016 Essentials end of support". Read 25 October 2026.

• "ESU offerings for Windows Server 2016 apply only to Windows Server 2016 Standard and Datacenter editions and do not extend support for Windows Server 2016 Essentials."

Source: Microsoft Learn, "Overview of Extended Security Updates for Windows Server 2012, and 2012 R2". Read 25 October 2026.

• "The Extended Security Update (ESU) program is a last resort option for customers who need to run certain legacy Microsoft products past the end of support."
• "Microsoft recommends that you upgrade to the current version of Windows Server for the most advanced security, performance, and innovation."
• "Extended Security Updates for Windows Server include security updates and bulletins rated critical and important for a maximum period of time from the end of extended support, depending on the version."
• "They're available free of charge for servers hosted in Azure, and available to purchase for servers not hosted in Azure."
• "Extended Security Updates don't include new features, customer-requested nonsecurity hotfixes, or design change requests."

Source: Microsoft Learn, "Product Lifecycle FAQ - Extended Security Updates". Read 25 October 2026.

• "The ESU program does not extend the product's lifecycle and does not provide technical support beyond the original support timeline."
• "Extended Security Updates are available through specific volume licensing programs or through Azure Arc-enabled servers for Windows Server."
• Eligibility, under the heading "Eligibility Criteria": "To qualify for ESU on-premises or in hosted environments, your server or operating system must meet one of the following prerequisites:"
  1. "Be covered by an active Software Assurance (SA) plan acquired through any program, such as Enterprise Agreement (EA), Enterprise Agreement Subscription (EAS), Server & Cloud Enrollment (SCE), or Enrollment for Education Solutions (EES)."
  2. "Have active subscription licenses acquired through any program, including Cloud Solution Provider (CSP)."
  3. "Have been acquired as 'License-Included' services through a Service Provider License Agreement (SPLA) partner."

In plain words (ours): Microsoft announced Extended Security Updates for Windows Server 2016 on 25 February 2026 and says they are now generally available through Azure Arc, for the Standard and Datacenter editions only. Whether a Standard or Datacenter server can be enrolled depends on how it is licensed, in the ways Microsoft lists above; Microsoft says it generally requires Software Assurance through a Volume Licensing program. If your server is Essentials, ESU is not an option for it. This page states no ESU cost: any cost figure in the report below comes from rates you enter.