Microsoft Knowledge Base Article 896993 contains the following summary:

As part of an ongoing commitment to provide detection tools and deployment recommendations for security updates, Microsoft is delivering this detection and deployment guidance for all bulletins during a Microsoft Security Response Center (MSRC) release cycle. This guidance contains recommendations that are based on the types of scenarios that may be used in various Microsoft Windows environments. This includes the use of tools such as Windows Update, Office Update, the Microsoft Baseline Security Analyzer (MBSA), the Office Detection Tool, Microsoft Systems Management Server (SMS), and the Enterprise Update Scan Tool. This document is a monthly supplement to the following Microsoft Knowledge Base article that gives specific detection and deployment recommendations based on the security release that is dated April 12, 2005:

            894193 How to obtain and use the Enterprise Update Scan Tool