Well after thinking about this and how great the team is at Avast - I simply assumed that the MS plug in for Outlook 2007 takes care of everything and I should set my outlook 2007 back to the normal SSL and TTL with the normal gmail ports 993 and 587.
To test this theory I went to avast mail shield, expert setting, Behavior and checked the tab to insert a note into clean message and sent myself a message. It came back with outgoing and incoming text added - so looks to me that Avast is scanning and is doing something "under the covers" when Outlook 2007 is used....
vast! Antivirus <http://www.avast.com> : Outbound message clean.
Virus Database (VPS): 1/30/2010
Tested on: 1/31/2010 8:45:47 AM
avast! - copyright (c) 1988-2010 ALWIL Software.
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avast! Antivirus: Inbound message clean.
Virus Database (VPS): 1/30/2010
Tested on: 1/31/2010 8:45:51 AM
avast! - copyright (c) 1988-2010 ALWIL Software.
http://www.avast.com