How to disable auto completion in Microsoft Outlook

  1. Open Microsoft Outlook.

  2. Click Tools and choose Options in the dropdown menu.

  3. Option window will appear, click Email Options under Preferences tab.

    Preferences tab
  4. Email Option window will appear, click Advanced E-mail Option button.

  5. Advance E-mail Option window will appear, remove the check on Suggest names while completing To, Cc, and Bcc fields.

    Advance E-mail Option window
  6. Click OK button. You'll return to E-mail Options. Then click OK button and you'll return to Option window.

  7. Click Apply button and click OK button.