Make sure your Outlook is closed, and access your computer's
'Control Panel,' usually found under the 'Start' menu.
Choose to 'View by: Large Icons' to make sorting easier, then click the
'Mail (32-bit)' option to access the mail profiles.
Select 'Show Profiles' from the 'Mail Setup' pop up screen.
Type the name of the new profile in the 'New Profile' popup, select 'Prompt for a profile to be used,' then 'OK.'
Enter your name, email address, and then password twice to verify. Select the 'Manual setup or additional server types' radio button and then click 'Next.'
Select the 'Microsoft Exchange Server or compatible service' radio button and click 'Next.'
Make sure the settings appear as above. Your server should read: outlook.office365.com and your User Name should be your Full Email Address. Click 'More Settings.'
Go under the 'Security' tab and change the Logon Network Security dropdown to display 'Anonymous Authentication.'
Go under the 'Connection' tab, select to 'Connect to Microsoft Exchange using HTTP' and the click the 'Exchange Proxy Settings' button.
Fill in all the values and check the boxes as shown above, then click 'OK.'
Click 'Finish' and open your Outlook to begin using your new address!