You can get the email addresses from the Mail Utilities block list into Anti-spam by extracting just the email addresses from the AutoWhitelist.xml in:

C:\Documents and Settings\All Users\Application Data\Exclaimer Ltd\Mail Utilities\AutoWhitelist

These can then be added into Exchange using the following article:

Once entered, you will be able to select “Refresh Data” within Anti-spam. The email addresses will then appear under Anti-spam Rules | Sender Block List.
How To