How to create an “All Documents” view?

By Default, Outlook does not provide All Documents view. You can use the Search Folder function to build one.
1.    Right click [Search Folders] on the left pane and [New Search Folder…]

2.    Select [Create a customer search folder] and click [Choose…]

3.    Fill “All Documents” into the Name field and click [OK]

4.    Select [Yes] and [OK] to confirm the setting.