To fix the "Microsoft Office LTSC Professional Plus 2021 Preview has expired" error, you must
replace the expired preview license with a valid full-version license or extend the trial period . Once the preview expires, the applications enter a read-only mode
, where you can only view or print documents but cannot create or edit them. 1. Activate with a Full License Key
If you have a legitimate full version of Office LTSC 2021, you do not necessarily need to uninstall the preview. You can activate it using a valid key. Microsoft Learn : Open any Office app (like Word) > Change Product Key . Enter your MAK (Multiple Activation Key) and select Via Command Prompt (Volume Licensing) Command Prompt as an administrator. Navigate to the Office folder: cd "\Program Files\Microsoft Office\Office16" Enter your product key: cscript ospp.vbs /inpkey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX cscript ospp.vbs /act University of Wisconsin–Madison 2. Reset the Trial Period (Temporary Fix)
If you need immediate access and do not have a key, you can reset the "grace period" (typically 30 days) using the Close all Office applications. File Explorer C:\Program Files\Microsoft Office\Office16 Program Files (x86) for 32-bit versions). Right-click on OSPPREARM.EXE and select Run as administrator Repeat this three times to ensure the counter resets. 3. Complete Reinstallation To fix the "Microsoft Office LTSC Professional Plus
If the preview version remains stuck in "expired" status despite trying new keys, you must perform a clean uninstall and reinstall the retail or full LTSC version. Uninstall Microsoft 365 or Office from a PC
If your Microsoft Office LTSC Professional Plus 2021 Preview has expired, it is because the preview period for that specific version has ended. Since LTSC (Long Term Service Channel) is a perpetual license meant for stability, the fix involves moving from the temporary preview license to a full, permanent license. 1. Purchase a Valid License
The preview version is not designed to be "unlocked" indefinitely; you must obtain a full license.
Option A: Perpetual License. Buy a one-time purchase of Office LTSC Professional Plus 2021 for a permanent, non-subscription version. Q3: Is there a free alternative to avoid this error
Option B: Microsoft 365. Subscribe to Microsoft 365 to get the latest features and cloud services. 2. Clean Uninstall of the Preview Version
To avoid activation conflicts, completely remove the expired preview software.
Go to Settings > Apps > Installed Apps (or Programs and Features in Control Panel).
Locate Microsoft Office LTSC Professional Plus 2021 Preview. Select Uninstall and follow the prompts. Uninstall Office via Settings → Apps → Microsoft
Restart your computer to ensure all background processes are cleared. 3. Install the Full Version
Use the Office Deployment Tool (ODT) to install the licensed version. Update Office LTSC 2021 - Microsoft Learn
A: Yes. You can switch to LibreOffice, Google Workspace, or OnlyOffice. They do not expire. But if you need 100% compatibility with complex Office macros, you must buy a license.
In the lifecycle of enterprise software, few messages induce as much immediate operational dread as the stark notification: "Your Office LTSC Professional Plus 2021 Preview has expired." For system administrators and power users who rely on Microsoft’s Long Term Servicing Channel (LTSC) for mission-critical stability, this error signals a complete cessation of editing capabilities. Unlike a simple licensing glitch, a preview expiration is a hard-coded kill switch. Understanding why this happens and how to surgically fix it is essential to restoring productivity.
This removes all preview components before deploying a perpetual or subscription license.
Steps:
cd C:\Program Files\Microsoft Office\Office16
cscript ospp.vbs /inpkey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
cscript ospp.vbs /act