Using Outlook for iOS in business environments for email and scheduling
From the MSN home page I click on the option for "outlook.com" near the top of the page on the left hand size. It is on the same line as the link to facebook, shopping etc. It is under the MSN search bar. (I click the "x" if a pop up ad is over the line and I can't see the line)
I hope this helps, and good luck