Steps to configure Office365 in Outlook for Mac using Exchange Configuration

Step 1: Open Outlook.
Step 2: From the Tools menu, select Accounts
Step 3: From the + drop-down menu, select Exchange
Step 4: In the Email Address field, enter your email address that belongs to Office365
Step 5: In the User name field enter your email address, then enter your identiKey password in the Password field and click Add account option.
Step 6: You will likely be presented with an autodiscover prompt. Check the Always use my response for this server, then click Allow.
Step 7: Your account will be configured and begin syncing.