MOSS2007 evalution version license expired

Evaluation version of Microsoft Office SharePoint Server 2007 for this server has expired

Option 1:

This may happen exactly 180 days after upgrading moss2007 from SP1 to SP2.

Simple way of sorting this is to re-apply the license key from the CA:

Central Administration > Operations > Convert License Type   and then enter the product key and click ok. This may perhaps take more than 2-3 hrs for global sync depending on the FARM size.

Option 2:

ACTION:
Current user updated MOSS2007 and registered his Volume License Key to the MOSS2007 Installation.
Current user tries to Access his "My Site" or Dashboards

RESULT: Current user receives following error:
"The evaluation version of Microsoft Office SharePoint Server 2007 for this server has expired."

CAUSE: Insufficient permissions for the groups WSS_WPG, WSS_ADMIN_WPG to the Registry. The application pool identity for your WSS/MOSS sites *MUST* be in the
"Distributed COM Users" group in order to successfully activate.

RESOLUTION:
We gave group WSS_WPG Read permissions to following registry key
HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\Office Server\12.0
We gave group WSS_ADMIN_WPG Full permissions to the same registry key
HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\Office Server\12.0

Add application pool Account ("dcomcnfg.exe") to the Distributed users and then reboot the server.