Having difficulty connecting Outlook to Office 365?
Check out our easy-to-use, self-guided walkthrough troubleshooter!
Office 365 Outlook Connectivity Guided Walkthrough
Still having issues? We have a plethora of resources available to resolve your problem:
Office 365: Outlook and mobile device connectivity troubleshooting resources
Finally, if your mailbox was migrated from Exchange Online ("EXO") Wave 14 to EXO Wave 15, you may need to update your Outlook profile. This is due to a change in EXO Wave 15 architecture in which we authenticate at the Transport layer (HTTPS) and no longer require RPC authentication (which will cause repeated prompting for credentials).
To fix the Outlook profile:
- Start Outlook
- Click "File"
- Click the "Account Settings" drop-down, then select "Account Settings"
- Select your e-mail address, and click "Change"
- Click "More Settings"
- Select the "Security" tab, and change the "Logon network security" drop-down to "Anonymous Authentication."
Props to Ryan Phillips for the EXO Wave 15 info!
Hope this helps,