SQL Server team released sevice pack 2 for all flavors of SQL Express. If you installed Business Contact Manager for Outlook 2007, you are running SQL Express SP1. BCM team has done extensive testing of SP2 to ensure it doesn't cause any problem with BCM functionality. Feel free to install SQL Express SP2 if you are running Business Contact Manager. You can download it from http://www.microsoft.com/downloads/details.aspx?FamilyId=d07219b2-1e23-49c8-8f0c-63fa18f26d3a&DisplayLang=en.