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FREE TOOL · LICENCE TERMS CHECKED 14 SEP 2026

Windows Server downgrade rights checker

Can your licence run Windows Server 2022, 2019 or 2016 instead? Do your CALs cover the server? Can you move the licence, or trust the COA on a used server? Pick how you got the licence and get a yes, check or no, with the exact licence clauses behind it. OEM, ROK, Volume Licensing and CSP are all different.

Checked against today’s date (2026-09-14). OEM downgrade answers change automatically when an earlier version leaves support.

Allowed
Based on Microsoft’s published licence terms, checked 14 September 2026. Not legal advice; your own agreement and licence terms decide.
Yes
Yes: Windows Server 2022, while Microsoft supports it

Your OEM licence lets you run Windows Server 2022 instead, until its support ends on 14 October 2031. You can run no more instances than your licence allows, and all cores must still be licensed.

Windows Server 2022: Extended Support ends 14 October 2031. Microsoft Lifecycle — Windows Server 2022
The clauses this is based on (2)
“you may create, store, and use an earlier version of the software for so long as Microsoft provides support for that earlier version”
Microsoft Software License Terms — Windows Server 2025 (OEM/retail) (July 2024)
“you will need to acquire licenses for all cores in the physical server”
Microsoft Software License Terms — Windows Server 2025 (OEM/retail) (July 2024)
Note
Media and product keys

Not included with the right. Here is where they usually come from.

  • A downgrade right is a right to use. It does not include installation media or a product key.
  • Dell sells downgrade kits with the server, and after the sale only if the server was bought with a Dell OEM Windows Server licence.
  • Never use keys from another organisation; volume licence keys are confidential to the licence holder.
The clauses this is based on (2)
“Neither the device manufacturer or installer, nor Microsoft, is obligated to supply earlier versions or other editions to you.”
Microsoft Software License Terms — Windows Server 2025 (OEM/retail) (July 2024)
“APOS downgrade kits are only available when the server was purchased with an OEM Windows Server license.”
Dell KB 000175471 — Windows Server Dell OEM license (updated Apr 2026)
Need licences, extra cores or a downgrade kit? We quote Volume Licensing, CSP and vendor downgrade kits alongside new and refurbished servers.
Downgrade rights

How you bought the licence decides what you can downgrade to

Volume Licensing and CSP licences let you run any prior version or a permitted lower edition, with the rules of the version you bought still applying; running an unsupported version is simply at your own risk. OEM licences that came with a server are narrower: Microsoft’s OEM terms for Windows Server 2019, 2022 and 2025 allow an earlier version only while Microsoft still supports it. That is why the right to run Windows Server 2016 on those licences ends on 12 January 2027, and why 2012 R2 is already off the table for those licences. The older Windows Server 2016 OEM terms have no support condition.

A 2019, 2022 or 2025 OEM licence can run an earlier version only while Microsoft supports it
2023202420252026202720282029203020312032203320342035Windows Server 2012 R2Ended 10 October 2023Windows Server 2016Until 12 January 2027Windows Server 2019Until 9 January 2029Windows Server 2022Until 14 October 2031Today
Extended Support end dates from Microsoft Lifecycle. The OEM terms for Windows Server 2019, 2022 and 2025 allow an earlier version "for so long as Microsoft provides support" for it; paid ESU does not count. The older Windows Server 2016 OEM terms have no support condition. Volume Licensing and CSP downgrade rights have no such time limit, although running an unsupported version is at your own risk.

Two points are genuinely unsettled, so the checker shows them as “check” rather than guessing. Microsoft’s 2022 and 2025 OEM terms don’t list lower editions (Microsoft’s guide and Dell say Datacenter-to-Standard is allowed, but the guide says it isn’t a legal use-rights document). And Dell’s ROK document says Dell ROK has no downgrade rights at all, which Microsoft’s OEM terms contradict.

Downgrade, down-edition and moving rights by licence channel
Rights by licence channelChannelEarlier supportedversionOut-of-supportversionDatacenter toStandardMove to anotherserverNew licence on arefurbished serverVolume Licensing (no SA)YesAllowed, at yourown riskYesYes, every 90 daysYesVolume Licensing + SA, orsubscriptionYesAllowed, at yourown riskYesYes; per-VM freelyin a server farmYesCSP perpetualYes (keys n-1/n-2)Allowed, at yourown riskYesYes, every 90 daysYesOEM (factory-installed)Yes, until supportendsNo (2019 termsonward); 2016terms: yesNot stated in2022/2025 termsNoNoHPE ROKYes, until supportendsNo (2019 termsonward); 2016terms: yesNot stated in2022/2025 termsNo, unlessreassignment SKUNo: new servers onlyLenovo ROKYes, until supportendsNo (2019 termsonward); 2016terms: yesNot stated in2022/2025 termsNo, unlessreassignment SKUConfirm with LenovoDell ROKSources conflictNo: Dell says nodowngrade rightsSources conflictNoNo: new servers only
Summarised from the Microsoft Product Terms and Universal License Terms (effective 1 September 2026), the Windows Server 2016/2019/2022/2025 OEM licence terms, Dell's ROK document (Rev. A04), HPE QuickSpecs and Lenovo LP1079. Amber means Microsoft's terms don't settle the point or vendor documents conflict. Use the checker above for the working and the clauses.
CALs and RDS CALs

CALs cover the same or earlier versions, never later ones

A Windows Server CAL covers its own version and earlier, so 2022 CALs don’t cover a 2025 server. When a server runs an earlier version under downgrade rights, Microsoft’s OEM terms expressly allow CALs of that earlier version; the Volume Licensing terms don’t address it, so confirm before relying on older CALs. Remote Desktop Services follows the same idea, with one more rule: the RD licence server must be at least as new as the RDS CALs it holds.

RDS CALs: newer CALs work with older hosts, and licence servers must be at least as new as the CALs
Session host versionHost2016 CAL2019 CAL2022 CAL2025 CAL2016YesYesYesYes2019NoYesYesYes2022NoNoYesYes2025NoNoNoYesRD licence server versionServer2016 CAL2019 CAL2022 CAL2025 CAL2016YesNoNoNo2019YesYesNoNo2022YesYesYesNo2025YesYesYesYes
From Microsoft Learn, License Remote Desktop Services with client access licenses (updated June 2025, checked September 2026). Each user or device also needs a Windows Server CAL. Upgrade the RD licence server before the session hosts.
Moving licences and used servers

OEM licences stay with the server; volume licences move every 90 days

An OEM or ROK licence is assigned to the server it came with and can’t be reassigned, even after a hardware failure, unless it was bought with reassignment rights. It can pass to a new owner, but only together with that server and all its COA labels. Volume Licensing and CSP core licences can be reassigned once every 90 days, or sooner after permanent hardware failure; only licences assigned per virtual machine, with Software Assurance or a subscription, move freely within a server farm.

Buying a used server with a Windows Server licence: four checks
1Is the COA fixed to this same server as supplied, not addedlater?No2Did every COA label and any additional core licences come withthe server?No3Has the seller stopped running the software, with no copieskept?No4Do the licensed cores cover every physical core (16 minimum, 8per CPU)?NoNot licensed for youLicense the server throughVolume Licensing or CSPinstead, or buy themissing core licences.All yes: it can be licensed for you. Get the history in writing.
From the Windows Server 2025 OEM licence terms, section 5.a: an OEM licence transfers only with the licensed server, all COA labels, any additional licences originally included, and the agreement. Rules differ for software acquired in Germany or other countries Microsoft lists; that list is currently unavailable, so we don't say whether it includes the UK.

Downgrade rights FAQs

Can I downgrade Windows Server 2025 to 2022 or 2019?

Usually, yes. Volume Licensing and CSP licences let you run any prior version in place of the one you licensed, with the licensed version's rules still applying. An OEM licence that came with the server allows an earlier version only for as long as Microsoft supports it: Windows Server 2022 until 14 October 2031 and 2019 until 9 January 2029. Dell ROK is the exception to check: Dell's ROK document says it carries no downgrade rights, which conflicts with Microsoft's OEM terms.

Can an OEM Windows Server licence run Windows Server 2016?

Only until Windows Server 2016 support ends on 12 January 2027. Microsoft's OEM terms for 2019, 2022 and 2025 allow an earlier version "for so long as Microsoft provides support" for it. After that date the OEM downgrade right no longer covers 2016. Paid Extended Security Updates don't change this: they need Software Assurance or a subscription, and Microsoft says ESU does not extend a product's lifecycle.

Do downgrade rights include the media and product key?

No. A downgrade right is a right to use the earlier version, not a promise of media or keys. Microsoft's OEM terms say neither the manufacturer nor Microsoft is obliged to supply earlier versions. Volume Licensing customers can use their product keys for downgrades; CSP supplies keys for one or two versions back for most products; Dell, HPE and Lenovo sell downgrade kits under their own conditions.

Can a Windows Server Datacenter licence run Standard?

With Volume Licensing or CSP, yes: the Product Terms list Datacenter to Standard or Essentials, and Standard to Essentials, as permitted down-editions, and the rights of the licensed edition still apply. Microsoft's OEM terms for 2022 and 2025 don't list lower editions. Microsoft's licensing guide and Dell say down-edition rights exist, but the guide is not a legal use-rights document, so check the terms that came with your server.

Do my 2022 CALs work with Windows Server 2025?

No. Windows Server CALs cover the same or earlier versions, not later ones, so users of a 2025 server need 2025 CALs. The same rule applies to RDS CALs: 2022 RDS CALs cannot be used with a 2025 session host, and 2025 RDS CALs must be installed on a 2025 RD licence server.

Can I move an OEM Windows Server licence to a new server?

Not unless it was bought with reassignment rights. An OEM or ROK licence is assigned to the server it came with and cannot be reassigned, even after a permanent hardware failure. HPE and Lenovo sell Datacenter licences with reassignment rights, which can move once every 90 days. Volume Licensing and CSP core licences can be reassigned every 90 days, or sooner after permanent hardware failure.

Is a refurbished server with a Windows Server COA sticker licensed?

It can be, but a sticker alone proves nothing. An OEM licence passes to a new owner only with the server it was licensed to, all its COA labels and any additional licences originally included, and the seller must stop using the software. The licensed cores must also cover every physical core in the server. A loose COA from another server does not license anything.

Can a ROK be used on a refurbished server?

Not from Dell: Dell says its ROK is designed exclusively for new server installations, deployed by a Dell-authorised reseller before the server reaches the customer. HPE's OEM licensing FAQ says OEM and ROK licences may only be sold with a new HPE server, and Lenovo limits base licences to the point of sale of the hardware. A ROK can never be bought separately for a server you already own. For refurbished servers, Volume Licensing or CSP is the safe route.

Related tools and guides

Sources

This checker summarises Microsoft’s published licence terms and vendor documents as of 14 September 2026. It is not legal advice: the terms that came with your licence, and your licensing agreement, decide. Vendor statements (Dell, HPE, Lenovo) are shown where Microsoft’s terms are silent and never produce a firm “yes”.

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