I am writing a plugin for Outlook 2007 using VSTO SE.

The plugin does the following job:
It adds a button to a custom ribbon.
When the button is clicked the mail is archived, and a footer
containing archivation data is added to the mail body.
After the mail is Archived i want to add a custom icon (logo of
archiving system) to the item in my inbox (next to the Flag and the
Category Icon).

I can't find any clues on how to implement this functional
requirement.
Is This Possible ? if yes in what way ? i have looked into both forms
and custom fields but are unable to find any clues that it is possible
to do this.