I have been following several threads on AVG 7 and problems with the email scanner. It appears that if you use Outlook Express you need to set up the server properties in the program.
I have read the article you gave the link for, and tried to follow the instructions. I cannot however find the 'wizard button' Grisoft refer to in the servers set up. Is it only available to the paid for version, as I, and I expect many others, only run the free version.