Hi, I think you looked at the settings a little to fast. It will work with outlook, by default, and outlook express if you enable the plugin.
This is from the AVG help.
Note: If you use a different e-mail program other than Microsoft Outlook, the error message on the button will read 'Non-Functional', because you are using an e-mail client not currently supported by AVG. Support for additional e-mail programs are being added all the time, so be sure you have the latest AVG updates. They just added the outlook express plugin.
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