How To Fix Microsoft Office Ltsc Professional Plus 2021 Preview Has Expired (2027)

The "expired preview" error in Microsoft Office LTSC Professional Plus 2021 typically occurs when a pre-release version of the software reaches its end-of-life date or when a preview-period license key is no longer valid. Fixing this requires transitioning from the preview license to a valid, permanent license—either a MAK (Multiple Activation Key) or a KMS (Key Management Service) license.

Open Control Panel:

To avoid activation conflicts, completely remove the expired preview software. The "expired preview" error in Microsoft Office LTSC

  1. Open Command Prompt as Administrator.
  2. Navigate to the folder containing your setup.exe and the XML file.
  3. Run the command: setup.exe /configure configuration.xml
  4. This will automatically remove the old preview and install the latest official version of Office LTSC 2021. You will then need to activate it with your key.

Step 1: Complete Uninstallation

A "Preview" version is a trial build that has a set expiration date. Once it expires, the apps enter read-only mode Open Command Prompt as Administrator

Method 6: Contact Your IT Department or Microsoft Support

If you are in a corporate environment, the preview may have been deployed via Group Policy or Microsoft Endpoint Configuration Manager. In this case, individual fixes will not work because the system automatically reinstalls the preview from a network share. Step 1: Complete Uninstallation A "Preview" version is

If the organization uses Key Management Service (KMS), the computer must contact the internal KMS host to activate. If using Multiple Activation Keys (MAK), the user must open an Office application, navigate to File > Account, and enter the 25-character key provided upon purchase. This step transforms the installed software from a trial state into a fully licensed product, permanently resolving the expiration error.