The following note has been added to the TechNet article Deploy Service Pack 2 for Project Server 2007:

Important:

Known issue: During the installation of 2007 Microsoft Office Servers SP2 (http://go.microsoft.com/fwlink/?LinkId=148351), a product trial expiration date is inadvertently activated that would cause the product to expire 180 days after installation. This issue is resolved by following the detailed steps in the Microsoft Knowledge Base (KB) article here (http://go.microsoft.com/fwlink/?LinkID=153131).