Attention: Important Information on SharePoint Server 2007, Project Server 2007, Form Server 2007, Search Server 2008 and Search Server 2008 Express

Attention: Important Information on Service Pack 2

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.

Which products are affected by this?
Applying Service Pack 2 to any of the following products will result in this issue: Office SharePoint Server 2007, Project Server 2007, Form Server 2007, Search Server 2008 and Search Server 2008 Express.

http://blogs.msdn.com/sharepoint/archive/2009/05/21/attention-important-information-on-service-pack-2.aspx