Connect Outlook 2010 to Office 365

Outlook 2010 does not automatically connect to Exchange Online, as it doesn't fully support the modern authentication system now used by Office 365. It can still be used to connect to Exchange Online though, if configured manually, using the steps below:

  1. Ensure Outlook/Office 2010 is fully updated, so that the version field shows: 14.0.70.15.1000
  2. Delete any existing mail profiles and/or start a new mail profile - reconfiguring an existing profile will not work (via control panel -> mail)
  3. Select "Manual setup or additional server types", then click Next.
  4. Select Microsoft Exchange Server/compatible service, then click Next.
  5. Enter the following in the corresponding fields:

    Server: outlook.office365.com

    User Name: email@domainname.com (Example: john@smith.com)

    then, click "More Settings..."

    *Note: Do not click the Check Name button at this step, or the configuration process will fail.

  6. Click the Security tab.

    Uncheck "Encrypt data between Microsoft Outlook and Microsoft Exchange".

    Choose "Anonymous Authentication" from the "Logon network security" drop-down menu.

  7. In the Connection tab, 

    Check "Connect to Microsoft Exchange using HTTP", then click "Exchange Proxy Settings..."

  8. In the "Use this URL to connect to my proxy server for Exchange" field, enter outlook.office365.com

    Check the "Only connect to proxy servers that have this principal name on their certificate", then enter msstd:outlook.com in the associated text field.
     
    Check the "On fast networks, connect using HTTP first then connect using TCP/IP" box. Select "Basic Authentication" from the "Use this authentication when connecting to my proxy server for Exchange" drop-down menu.
  9. Click On OK
    Click On Apply/OK
  10. Click Check Name.
  11. An authentication prompt will appear. 
    - Enter your (email@yourdomain.com) and Office 365 password in the corresponding fields.
    - Check The "Remember my credential" if you wish to not enter your email and password each time you open the outlook.
    then click OK
  12. Click On Next 
  13. Click Finish. 
  14. The account will be setup and you can open Outlook to begin using your Exchange account.
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