While looking for IMF like settings on an Exchange 2007 installation, I decided to run the Exchange Best Practices Analyzer Tool.
The following is from the Exchange Best Practices Analyzer Tool Help File:
Topic Last Modified: 2007-07-30
The Microsoft Exchange Analyzer Tool queries the Exchange environment for the presence of Exchange Server 2007 Hub Transport or Mailbox server roles.
If either Exchange Server 2007 Hub Transport or Mailbox server roles are found, the Exchange Analyzer executes the following Exchange Management Shell cmdlet to query for value of the SCLJunkThreshold parameter for the Exchange organization: Get-OrganizationConfig
The SCLJunkThreshold parameter for an organization specifies the Spam Confidence Level (SCL) at which a message is moved to the Junk E-mail folder.
If the Exchange Analyzer determines that the SCLJunkThreshold parameter for an organization is set to the default value of 8, the Exchange Analyzer displays a warning.
This warning indicates that the spam confidence level threshold for moving messages to the Junk E-mail folder is set so that mail from legitimate users may be filtered and moved to the Junk E-mail folder as Junk Mail. The recommended value for the SCLJunkThreshold parameter is 4.
To address this warning, use the Set-OrganizationConfig cmdlet in the Exchange Management Shell to set the value of the SCLJunkThreshold parameter to 4.
To set the value of the SCLJunkThreshold parameter to 4 using the Set-OrganizationConfig cmdlet
The following code is an example of the Set-OrganizationConfig command that sets the value of the SCLJunkThreshold parameter to 4.