Outlook – How to change the default program used by Outlook 2010 for displaying the source of an email

I found a solution that seems to work (I'm using Outlook 2007). Say you got an email and you hit reply. Looking at your reply email with that blue indent line click on the "options" pull down menu and then change the format to "Rich Text". Enter your reply in the body of the email and select your reply line or paragraph and then ctrl-Q. The blue line for that paragraph or email is gone. I tested this by sending the email back to myself and it seems to work.

If the format is HTML it won't work... although ctrl-Q seems to remove the blue indent line when I send the email back to myself the line comes back. But in Rich Text format the solution sticks...

I think I have a solution: Go to Word > Word options > Advanced > General / Web options > Pictures: If target monitor has the value 72 for pixels per inch, change this to 96. Restart Word & Outlook.

This finally fixed it for me. Hope it helps.