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Click or double-click the Outlook app icon, which resembles a white "O" on a dark-blue box. It's in the menu bar at the top of the screen. This opens a drop-down menu. It's the third option in the drop-down menu. When Outlook is in offline mode, you'll see a checkmark next to "Work Offline" in the main Outlook drop-down menu. To disable the offline mode, make sure there is no longer a checkmark next to "Work Offline" in the main Outlook drop-down menu.
Open Outlook. Click Outlook. Click Work Offline.