English
Español
Français
Deutsch
العربية
Português
Italiano
Polski
You bought an Office LTSC MAK key and now you want it installed and activated the right way — genuine, permanent, and done in a few minutes. The good news is that the process is simpler than most people expect. Office LTSC (Long-Term Servicing Channel) is the volume edition of Office designed for one-time purchase, offline-friendly use, and a MAK (Multiple Activation Key) is exactly what you use to license it.
This guide walks you through the whole thing end to end: installing Office LTSC with Microsoft’s Office Deployment Tool, then activating your MAK key three different ways — inside any Office app, from the Command Prompt with ospp.vbs, and by phone if online activation is blocked. Everything below reflects how Microsoft actually handles LTSC volume licensing, so you can follow it with confidence.
⭐ Key Takeaways
- Office LTSC is installed with Microsoft’s free Office Deployment Tool and a small configuration XML — not the regular Microsoft 365 installer.
- The fastest activation is in-app: File → Account → Change Produkt Key, paste the MAK, done online in seconds.
- The command-line method uses ospp.vbs: install the key with /inpkey, activate with /act, and verify with /dstatus.
- If online activation fails, phone activation via slui 4 or the automated line always works.
- A MAK activates the number of PCs its allowance covers — a 1-PC key licenses one machine, a 5-PC key licenses five.
On this page
Before you start: install Office LTSC via ODT
Office LTSC 2021 and 2024 are volume Produkte, so they don’t install from the consumer Microsoft 365 page. Instead you use the Office Deployment Tool — a free, official Microsoft utility that downloads and installs exactly the LTSC build you want. If your seller already gave you a ready-made installer or a configuration file, you can skip straight to the activation steps below.
Here is the standard ODT install:
- Download the Office Deployment Tool from the Microsoft Download Center and run the self-extractor into a folder, for example C:\ODT. This gives you setup.exe plus sample configuration files.
- Create a configuration XML that specifies the product. For Office LTSC 2021 Pro Plus the product ID is ProPlus2021Volume; for 2024 it is ProPlus2024Volume. Set the channel to PerpetualVL2021 or PerpetualVL2024 accordingly, and choose your language and 64-bit architecture.
- Open Command Prompt as Administrator, change into the ODT folder, and run setup.exe /download configuration.xml to pull the files, then setup.exe /configure configuration.xml to install.
Tip: if you’d rather not hand-write XML, Microsoft’s Office Customization Tool (config.office.com) builds the configuration file for you with a few dropdowns. Leave the product key out of the XML for now — it’s cleaner to enter your MAK after installation using one of the methods below.
Note: LTSC and Microsoft 365 cannot coexist on the same PC. If a click-to-run Microsoft 365 or a trial version of Office is already installed, uninstall it first — otherwise the LTSC install will fail or the wrong product will try to activate.
Activate in-app (the fastest method)
Once Office LTSC is installed, the simplest way to apply your MAK key is from inside any Office application. This works online and takes under a minute:
- Open Word, Excel, or any Office app.
- Go to File → Account (in some apps it’s labeled Office Account).
- Under the product information, click Change Produkt Key (or Activate Produkt if it hasn’t been licensed yet).
- Type or paste your 25-character MAK key and confirm.
- Office contacts Microsoft’s activation servers over the internet and switches to Produkt Activated. Close and reopen the app if the banner doesn’t clear immediately.
That’s it — no command line needed. If your PC is offline or the in-app dialog throws an error, use the Command Prompt or phone methods below instead.
Activate via Command Prompt (ospp.vbs)
The command-line route is the most reliable, especially for technicians, offline scenarios, or when you want to confirm the exact license status. It uses ospp.vbs, Microsoft’s Office Software Protection Platform script that ships inside every Office install.
Step 1 — open Command Prompt as Administrator (right-click Start → Terminal (Admin) or Command Prompt (Admin)).
Step 2 — change to the Office folder. For 64-bit Office on 64-bit Windows this is usually:
- cd “C:\Program Files\Microsoft Office\Office16”
- If Office is 32-bit on 64-bit Windows, use cd “C:\Program Files (x86)\Microsoft Office\Office16” instead. (Both LTSC 2021 and 2024 use the Office16 folder name.)
Step 3 — install your MAK key, replacing the X’s with your actual 25-character key:
- cscript ospp.vbs /inpkey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
Step 4 — activate online:
- cscript ospp.vbs /act
You should see Produkt activation successful. Step 5 — verify the result any time with:
- cscript ospp.vbs /dstatus
The /dstatus output shows the license name, the last five characters of the installed key, and a LICENSE STATUS: —LICENSED— line confirming everything is genuine and active. Keep this open if you ever need to prove activation or troubleshoot.
Phone activation (when online fails)
If the servers are unreachable, the key has been used across several machines, or you’re on a locked-down network, phone activation is the guaranteed fallback. Some LTSC 2024 MAK keys are even sold specifically for phone activation.
- First install the key using either method above (in-app Change Produkt Key or cscript ospp.vbs /inpkey).
- Open the phone activation wizard by pressing Windows + R, typing slui 4, and pressing Enter.
- Select your country or region. Windows displays a Microsoft toll-free number and a long Installation ID.
- Call the number, follow the automated system, and read out (or enter) the Installation ID.
- The system reads back a Confirmation ID — type it into the wizard and click Activate Office.
Once accepted, run cscript ospp.vbs /dstatus to confirm the license shows as activated. Phone activation produces the same genuine, permanent result as online activation.
Common errors and fixes
| Symptom | Likely cause & fix |
|---|---|
| “This product key has already been used” or activation count exceeded | The MAK’s PC allowance is used up. Move to phone activation via slui 4, or use a fresh key for the extra machine. |
| ospp.vbs “file not found” | You’re in the wrong folder. Confirm whether Office is 32-bit or 64-bit and use the matching Program Files path; the subfolder is Office16. |
| “The product key you entered cannot be used” | The key type doesn’t match the installed edition — e.g. a 2021 key on a 2024 build. Reinstall the correct LTSC version with ODT. |
| Online activation error 0x8004FC12 / 0xC004F074 | Activation server temporarily unreachable. Retry cscript ospp.vbs /act, check the date/time and internet, or switch to phone activation. |
| Office still shows unlicensed banner after activating | Fully close all Office apps and reopen, or reboot. Then verify with /dstatus. |
📦 Genuine Office LTSC MAK Keys
Frequently Asked Questions
Do I need the Office Deployment Tool, or can I use a normal installer?
Office LTSC is a volume product, so it’s installed with the free Office Deployment Tool and a configuration XML rather than the consumer Microsoft 365 setup. If your seller supplied a ready-made LTSC installer or config file, you can use that directly and skip building the XML yourself.
What’s the difference between in-app and ospp.vbs activation?
They achieve the same result. The in-app method (File → Account → Change Produkt Key) is quickest for a single PC, while ospp.vbs is better for offline machines, scripting, and confirming the exact license status with /dstatus.
Where is the Office16 folder for ospp.vbs?
For 64-bit Office it’s C:\Program Files\Microsoft Office\Office16, and for 32-bit Office on 64-bit Windows it’s C:\Program Files (x86)\Microsoft Office\Office16. Both LTSC 2021 and 2024 use the Office16 folder name.
How many PCs can one MAK key activate?
A MAK activates the number of PCs its allowance covers. A 1-PC key licenses a single machine; a 5-PC key licenses five. Once the allowance is used, additional activations must go through phone activation or a new key.
Online activation failed — what now?
Check your internet connection and the system date/time, then retry cscript ospp.vbs /act. If it still fails, run slui 4 for phone activation, which works even when the online servers are unreachable.
Is a MAK-activated Office LTSC genuine and permanent?
Yes. A MAK is Microsoft’s volume activation method, and once activated the license is genuine and does not expire — Office LTSC is a perpetual, one-time-purchase product with no subscription.
Final thoughts
Activating Office LTSC with a MAK key is a short, predictable process once you know the three routes. Install with the Office Deployment Tool, then activate whichever way suits you: paste the key in-app for speed, use ospp.vbs when you want control and verification, or fall back to phone activation if online is blocked. Verify with /dstatus and you’re done — genuine, permanent Office with no subscription. If you still need a key, SoftKeys stocks genuine Office LTSC 2021 and 2024 MAK keys for a fraction of retail, delivered instantly.
