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Exchange Server 2003: Configure Windows/Microsoft Update to Check for Intelligent Message Filter (IMF) Updates

1. Start RegEdit.
    
2. Move to HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange
    
3. Create the following DWORD value: ContentFilterState
    
4. Set the value to one (1).
    
5. Restart the SMTP service.

The next time you run Windows Update or Microsoft Update, the IMF will be updated.