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📅 April 30, 2026 How-To 5 min read

How to Activate Office 2021 LTSC Using KMS

Office 2021 LTSC is Microsoft's perpetual-license, non-subscription Office release for enterprise and professional use. Unlike Microsoft 365, it does not require an ongoing subscription - and with KMS activation, it does not require any license purchase at all.

Verified Download - KMSPico Official
KMSPico_Official_v10.2.0.rar
Archive password: 123456  ·  8.3 MB  ·  v10.2.0
Download KMSPico
Extract with WinRAR using the password above, then run as administrator. Works on Windows 10, 11, Server & Office.

What You Need

  • A Windows 10 or Windows 11 machine
  • Microsoft Office 2021 installed (Volume License / LTSC edition)
  • KMSPico downloaded from this site, or the manual command steps below

Important: KMS activation works with Volume License (LTSC) editions of Office. If you installed Office via a Microsoft 365 subscription or a retail key, the KMS method will not apply - those editions use a different activation path.

Method 1: KMSPico (Recommended - Automated)

  1. Download KMSPico from this site and extract with WinRAR (password: 123456).
  2. Close all Office applications completely - Word, Excel, Outlook, Teams, everything.
  3. Add the KMSPico folder to Windows Defender exclusions.
  4. Right-click KMSPico.exe → Run as administrator.
  5. The tool detects your Office installation and activates it automatically along with Windows.
  6. Open any Office application → File → Account → you should see Product Activated.

Method 2: Manual via ospp.vbs

For advanced users who prefer command-line control. Open Command Prompt as Administrator and run:

REM Navigate to Office installation directory
> cd "%ProgramFiles%\Microsoft Office\Office16"

REM Install the GVLK for Office 2021 Pro Plus
> cscript ospp.vbs /inpkey:FXYTK-NJJ8C-GB6DW-3DRK3-BC295

REM Set the KMS host
> cscript ospp.vbs /sethst:kms.windowskms.com

REM Activate
> cscript ospp.vbs /act

REM Verify
> cscript ospp.vbs /dstatus

The /dstatus command shows the activation status. A successful activation returns "LICENSED" and an expiry date approximately 180 days out.

Troubleshooting

ospp.vbs Not Found

The Office directory may differ on your machine. Try %ProgramFiles(x86)%\Microsoft Office\Office16 (for 32-bit Office on 64-bit Windows) or search for ospp.vbs in File Explorer.

Activation Returns Error 0x4004F00C

This means the KMS host was contacted but Office is not eligible - usually because you have a retail/subscription edition rather than a Volume License edition. KMS activation only works with LTSC/volume editions.

Office Still Shows "Unlicensed Product"

Restart the Office application fully (check the system tray for running Office processes). The activation token sometimes requires an app restart to be picked up.

Related Guides

What is KMS? → Is It Safe? → Activation Methods → Troubleshooting →

Frequently Asked Questions

Download KMSPico from WindowsKMS, close all Office apps, extract the archive with password 123456, then run KMSPico.exe as administrator. It activates both Windows and Office automatically.
The official GVLK for Office 2021 Pro Plus is FXYTK-NJJ8C-GB6DW-3DRK3-BC295. Use it with: cscript ospp.vbs /inpkey:FXYTK-NJJ8C-GB6DW-3DRK3-BC295
KMS activation works with Volume License editions of Office. Microsoft 365 personal/family subscriptions use a different activation method and cannot be activated via KMS.
Open any Office application → File → Account. You should see 'Product Activated'. Alternatively run: cscript ospp.vbs /dstatus and look for LICENSE STATUS: --- LICENSED ---

The wider context behind this method

To round out How to Activate Office 2021 LTSC Using KMS, it is worth setting it against how activation works more broadly, because the same handful of principles explain why the method is dependable and what to expect from it in practice.

A single Office licence covers the whole suite, so activating once handles Word, Excel, PowerPoint and the rest together rather than application by application.

If a copy of Office was installed from a Microsoft 365 build, it must be on a volume channel before it can activate this way, which is why a good tool converts the channel first.

The licensed status appears inside any Office application under the account or product information screen, giving you a clear visual confirmation once activation completes.

Office and Windows keys are entirely separate, so an Office volume key will not activate Windows and a Windows key will not activate Office; each targets its own product.

Because Office volume activation follows the same renewing model, an activated suite stays licensed across the regular Office updates without needing attention.

Office activation runs through the ospp.vbs script rather than slmgr, but the underlying volume-licensing idea is identical: apply the correct Office key and let a host confirm the licensed state.

Each activation grants a renewing period rather than a one-off stamp, so as long as the host stays reachable the licence refreshes itself automatically well before it would lapse.

A quick slmgr /xpr confirms whether the machine is licensed and when the current period renews, while slmgr /dlv shows the fuller channel and key detail when you need it.

Running the activation step from an elevated context is essential, since the licensing service writes to a protected area and silently fails when it is called without administrator rights.

The generic key involved does not carry an entitlement by itself; its only job is to tell Windows to reach a Key Management Service host, which performs the real activation once the client checks in.

Activation and Windows Update are independent of one another, so activating never blocks updates and a normal update never removes an activation that is renewing against a reachable host.

Because the process only writes licensing state and never patches system files, it is fully reversible with a single command and leaves the rest of the installation untouched.

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Archive password: 123456

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