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On the classic Outlook, go to the Folder tab and selectÂ
 New Folder, or press Ctrl+Shift+E.On the Simplified ribbon, select MoveÂ
 > Other Folder. In the Move Items dialog, select New. -
Name the folder, select what it will contain and where you want to place it, and select OK.
Tip:Â Another method is to right-click the parent folder and then select
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In Outlook for Mac, in the folder pane on the left, select the position where you want to add a new subfolder.
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Go to File > New > Folder.
(A new "Untitled Folder" is immediately created with its name selected.)
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Enter a new name for the folder, then press Enter.Â
Tip:Â Another method is to control+click the parent folder and select New Folder.
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In new Outlook, in the folder pane on the left, right-click the folder that you want to add a subfolder to.
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Select Create new subfolder.
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Enter a name for the new folder, then press Enter.