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Guide · Windows Server

Windows Server 2016 ESU cost: what Microsoft charges per core

Updated · Rotomal

Windows Server 2016 Extended Security Updates bought through Azure Arc cost $0.007132 per core per hour for Standard and $0.041067 for Datacenter in Microsoft's own price list (effective 1 August 2026, checked 3 November 2026). That is about $5.21 and $29.98 per core a month, or about $83 and $480 a month for the 16-core minimum per physical server. Billing starts on 13 January 2027 and coverage runs to January 2030. We found no published volume-licensing price for 2016 ESU, and moving the server into Azure does not make 2016 ESU free.

The published rates

Microsoft's Azure Retail Prices API, its machine-readable price list, has these Windows Server 2016 ESU meters in US dollars (checked 3 November 2026). Monthly figures use 730 hours, the month Azure bills on.

MeterRatePer core per month16 cores per month16 cores per year
WS2016 Std 1C ESU (Azure Arc, Standard)$0.007132 per core-hourabout $5.21about $83.30about $1,000
WS2016 DC 1C ESU (Azure Arc, Datacenter)$0.041067 per core-hourabout $29.98about $479.66about $5,756
WS 2016 [n] vCPU ESU (Windows Server VMs in Azure, one meter per VM size)$0.007132 per vCPU-hour (effective 1 September 2026)about $5.21 per vCPUabout $83.30 for 16 vCPUsabout $1,000

Microsoft's readable Azure Arc pricing pages had not caught up with these figures when we checked; the numbers above are from the price list itself.

Worked examples

ServerLicensing basisMonthlyThree years
One physical Standard server with 8 cores16 physical cores (the minimum applies)about $83.30about $2,999
One Standard VM with 4 vCPUs on a newer host8 virtual cores (the minimum per VM)about $41.65about $1,499
One physical Standard server with 32 cores32 physical coresabout $166.60about $5,998
A Datacenter host with 16 cores running many 2016 VMs16 physical cores, Datacenterabout $479.66about $17,268

Three-year totals assume today's rate holds for the whole period. For comparison, Microsoft lists Windows Server 2025 Standard at $1,176 for 16 core licences (US MSRP), plus CALs. One year of Standard ESU for a 16-core server costs about the same as that new licence, which is why ESU is usually bought for the servers that cannot move by January, not for all of them.

The rules that change the bill

  • Minimums: 16 physical cores per machine, or 8 virtual cores per VM. Virtual core licences are Standard only.
  • Eligibility: you attest to Software Assurance or an equivalent server subscription; machines licensed through SPLA or a server subscription do not need Software Assurance. ESU covers Standard and Datacenter, not Essentials.
  • Billing starts on 13 January 2027 and is monthly. A licence provisioned later is back-billed to 12 January 2027, so waiting does not save money.
  • No free extras for 2016: Microsoft says the no-cost disaster recovery benefit and the Visual Studio dev/test benefit are not available for Windows Server 2016 ESUs.
  • You can lower the core count or deactivate a licence once a server is upgraded; charges continue for up to five calendar days after the change.
  • Moving from volume licensing to the Azure Arc route is not supported for Windows Server 2016 ESUs, and we found no published volume-licensing price for 2016 ESU.

Is ESU free if the server moves to Azure?

Not for Windows Server 2016. Free ESU for Azure VMs was part of the Windows Server 2012 programme. Microsoft's licensing news says ESU offerings released from 1 April 2026 have the same list price whether you buy in Azure, on-premises or in another cloud, and its price list has a Windows Server 2016 ESU meter for Azure VMs at the same $0.007132 per vCPU-hour. The Windows Server 2012 and 2012 R2 ESU programme itself ended on 13 October 2026.

Key ESU dates

DateWhat happens
3 August 2026Windows Server 2016 ESU licences can be configured in the Azure portal
6 August 2026Microsoft announces general availability of 2016 ESU enabled by Azure Arc
12 January 2027Windows Server 2016 end of support
13 January 2027ESU billing begins
January 2030End of ESU coverage (Microsoft: 12 January 2027 through January 2030)

Deciding server by server

Price ESU only for the servers that truly cannot be upgraded or migrated before January, and set a date to turn each licence off. Server 2016 Exit Plan gives each server a written path for a one-time $199, including the ESU core count to buy where it makes sense and the upgrade route for the rest.

Questions

How much does Windows Server 2016 ESU cost?

Through Azure Arc, $0.007132 per core per hour for Standard (about $5.21 per core a month) and $0.041067 for Datacenter (about $29.98), from Microsoft's price list on 3 November 2026. With the 16-core minimum, a physical Standard server costs about $83 a month.

When does billing for Windows Server 2016 ESU start?

On 13 January 2027. A licence you provision later is back-billed to 12 January 2027.

Can I buy Windows Server 2016 ESU without Azure Arc?

Microsoft documents the Azure Arc route, and we found no published volume-licensing price for 2016 ESU when we checked on 3 November 2026. Ask your licensing reseller if you need another route.

Do I need Software Assurance?

You attest to Software Assurance or an equivalent server subscription. Machines licensed through SPLA or a server subscription do not need Software Assurance.

Does ESU cover Windows Server 2016 Essentials?

No. Microsoft says Windows Server 2016 ESUs support the Standard and Datacenter editions. Essentials reaches end of support on 12 January 2027 with no ESU option.

Sources

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