Using older versions of Outlook for Mac in business environments
@RetiredGeek: Thanks very much for the step-by-step instructions. I set up a Rule for my IMAP (yahoo mail) account, but it didn't seem to work, even after closing Outlook and my web mail and reopening. In addition, one (unimportant) email in my yahoo account disappeared into the ozone. So, I deleted the rule for now and may try it again by setting up the same rule for IMAP and Exchange. I'm just a little leery to mess around with this too much because my exchange account is linked to a client of mine.
In the meantime, I have all my other yahoo email folders copied to the exchange account for "safekeeping" and will file new emails as they arrive in 3 places - in my yahoo online folders, in my Outlook mail folders, and in the exchange folders I created. That way, I can allow the yahoo-Outlook syncing circus to carry on without sweating it, knowing I have everything important filed in the exchange folders.
Fortunately, I don't get a ton of important emails every day - just a handful most days.