a9d1162f_ell_Mail_with_an_email_program__Try_this_
[How do I…?] Make "reply all" your default reply [Try this:] 
Click the Options icon and then select More mail settings. Under Reading email, click Make "Reply-all" my default response. Select Yes and then select Save. Click the Outlook logo to go back to your inbox.
How to use Bell Mail : Using Bell Mail with an email program
Try this: