Create a new email to verify the new default zoom level.ħ. SAVE THE MESSAGE, which will now show up in the 'Draft' folder, and close the email.Ħ. Change the zoom to the desired level and click 'OK.'ĥ. Click on the 'Format Text' tab then on the 'Zoom' button.Ĥ. Place the cursor in the body of the message.ģ. So you can change the default Zoom size from 'Mail Composer -> Format Text -> Zoom'Ģ. In Outlook 2007, if we change the Zoom size of Mail Compose Editor for one mail that is going to be the default Zoom size for all mails.