1) Open Outlook and then click E-mail Accounts on the Tools menu
2) Select View or change existing email accounts and then click Next
3) Double-click the e-mail account you want to configure, click More Settings.., and then click the Advanced tab
3. Click the "Leave a copy of messages on server" check box to select it, click OK, and then click Close
4. Quit and then restart Outlook to have the change take effect.
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