I have version 1, 2 or 3 of SpamBully, What enhancements do I get if I upgrade to SpamBully 4?
Please see http://www.spambully.com/features.php . Each new item has a new or improved icon to denote any changes. Take a look at the screenshots on this page as well.
Also, you can download the 14 day free trial at:
http://www.spambully.com/download.php
If you decide it isn't right for you just uninstall SpamBully 4 and reinstall your older version and all of your old version settings will be preserved.