Configure the Email Client to Leave Messages on Server After Retrieval - Outlook® 2007

  1. From the top menu, click Tools > Account Settings.
  2. Double-click the desired email account.
  3. Click More Settings.
    Account settings
  4. From the Advanced tab, ensure 'Leave a copy of messages on the server' is selected then click OK.
    Advanced settings
  5. Click Close.
  6. Click Finish.