Important Information on Service Pack 2
If you have recently installed applied Service Pack 2 (SP2) for Microsoft Office SharePoint Server 2007, this information is of high relevance to you.
A bug with Service Pack 2 (SP2) that affects all customers that have deployed it for SharePoint Server 2007 has been identified.
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. Furthermore, product expiration 180 days after SP2 installation will not affect customer’s data, configuration or application code but will render SharePoint inaccessible for end-users. Please read further information at the official SharePoint blog,http://blogs.msdn.com/sharepoint/archive/2009/05/21/attention-important-information-on-service-pack-2.aspx
Another great resource is Brian Smith’s Blog: