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Click on File on the top left corner.
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Click on Options in the sidebar.
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Select on the Advanced tab.
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Scroll down to Send and receive and click on the Send/Receive… button.
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Make sure Schedule an automatic send/received every _____ minutes is checked in the window that appears, then set the minutes by typing a number into the box next to “minutes” or by clicking on the up or down arrow in that same box.
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Click Close to close the send/receive options window, then click OK to close the Outlook Options window.
Outlook will now automatically attempt to send or receive mail as often as you have specified.