AntiSpam as written has a number of bugs and deficiencies:
1. When messages are selected and This is Spam is clicked, the Processing dialog and its associated processes completely take over. You cannot do anything in the mail client until it finishes whatever it's doing, and it's pretty slow at it. The program should be rewritten so that, once you've clicked This is Spam, the processing is done as a background process, and no dialog is displayed. If there's risk of interference from users attempting to do things with the messages previously selected, just forbid access to those messages, but don't restrict the user from any other actions in the mail client.
2. Periodically, This is Spam and This is not Spam in the AntiSpam menu are greyed out and remain greyed out until Outlook Express is closed and restarted. It doesn't matter how long you wait. These options are greyed out and never become active again until Outlook Express is closed and restarted.
3. When the unnecessary Processing dialog box is displayed (see #1), it causes the mouse cursor to jump to the left most of the way across the screen every time it processes a message. The best thing would be to just get rid of the Processing dialog box altogether, since it doesn't provide any useful information.
Most of the apps in NIS 2011 seem to be well designed and well implemented, but AntiSpam seems just the opposite. It seems to be poorly architected and poorly coded. It's slow, clumsy, and amateurish.