Bug with Service Pack 2 (SP2) for SharePoint Server 2007

During the installation of SP2, a product expiration date is improperly activated.  This means SharePoint will expire as though it was a trial installation 180 days after SP2 is deployed.  The activation of the expiration date will not affect the normal function of SharePoint up until the expiration date passes, 180 days after the SP2 installation will render SharePoint inaccessible for end-users but will not affect data, configuration or application code.

You can manually fix the error by re-entering your Product ID number (PID) on the Convert License Type page in Central Administration.  For more information and detailed steps please read this KB article.

For more information please refer to this blog posting from the Microsoft SharePoint Product Group.