Microsoft Exchange couldn’t successfully use the Microsoft Update agent: %1. Please see http://update.microsoft.com and update your client manually. Anti-spam updates will not be downloaded until this problem is fixed.

This Error event indicates that Microsoft® Exchange Server could not successfully use the Microsoft Update agent. This event occurs when anti-spam updates are not loaded.

This may be caused if you are not running the latest version of Microsoft Update. You cannot download anti-spam updates until this problem is fixed.

To resolve this error, follow these steps:

• Upgrade the version of Microsoft Windows® update on the computer that logged this event. To do this, visit the Microsoft Update Web site and update your server. When you connect to that Web site, your system will be checked. You will be instructed to download and install the most recent version of Microsoft Update.

• Review the WindowsUpdate.log file for information that could indicate the cause of the problem. By default, WindowsUpdate.log is located in the C:\Windows directory, where C:\ is the directory where you installed Windows Server®.

For more information about anti-spam updates, see the following topics:

• Anti-Spam Updates

• How to Configure Anti-spam Automatic Updates

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.