MBSA 2.1 available
Microsoft Baseline Security Analyzer (MBSA) is an easy-to-use tool designed for the IT professional that helps small- and medium-sized businesses determine their security state in accordance with Microsoft security recommendations and offers specific remediation guidance.
In order to ensure compatibility with Windows Vista, MBSA 2.1 Beta 1 is now available. Beta 1 maintains the current MBSA 2.0.x functionality but adds Windows Vista support.More information at: MBSA 2.1 page.
You can download the MBSA 2.1 installer from the Microsoft Download Center.