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https://support.microsoft.com/en-us/help/4026268/windows-10-change-startup-apps

Move the Navigation bar back to the bottom of Outlook

A recent Outlook update moved the navigation bar from here:

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to here:

To return it back to the bottom:

1. Open the Outlook desktop app.
2. Click File, then Options.
3. In the window that opens, select Advanced.
4. Under the Outlook Panes section, uncheck the box that says "Show apps in Outlook."
5. Restart Outlook and your navigation bar would be relocated at the bottom.
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