"The update applies to the tools shipped with Exchange Server 2007 systems with Service Pack 1 applied. It is currently only available for English language servers at this time.
The following tools have received an updated set of rules:
1. Best Practices Analyzer
2. Disaster Recovery and Performance Troubleshooter
What is contained in the update?
The update contains mainly bug fixes for the above tools.
The BPA tool is also run automatically during setup and readiness checks. We have updated the prerequisites XML file for setup. So any Exchange setup launched on a machine connected to the Internet will download the updated prerequisites file to check for the correct prerequisites."