I see the dialog box for rules. It starts out with "When a new message arrives..." and then gives the conditions and what it will do.

I want to make a rule that does something to all my EXISTING mail. (If it has a certain subject put it into a certain folder, etc.)

I believe that Mac Mail will do this. When I make a rule in Mac Mail it asks me if I want to apply the rule right now, to existing mail.

Can Outlook for Mac rules do anything except actions on new mail that arrives?

Thanks, JP