I tried every server address listed in the "About" section of the Outlook Web Access settings/options page. I think it's a weird setup because there's not even an option for me to change the password, etc. (I was looking at the help guide side-by-side with the actual screen and it just wasn't there.) Fortunately the Office 365 account was easy to add to Gmail, so looks as if 75% of my email has been consolidated into a single app. Thanks for all of the help!