Outlook stops auto filling / completing email addresses

Office365

  1. Click File, then Options and then Mail.
  2. Scroll down to Send messages. 
  3. Make sure Use Auto-Complete List is selected. 
  4. If it is off, turn it on and then click OK.
  • If it is already on and your auto-fill is still not working, click Empty Auto-Complete List button and then click OK to reset your auto-fill list. You will have to type each email address the first time you send to it, but after that it will be remembered and auto-fill/complete as expected.
  • This link here will also provide information about the auto complete list. 

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