Use these instructions to apply the current view to all folders.

1. In Outlook, click the View tab.
2. In the View menu, click the Change View drop-down menu.
3. From the Change View drop-down menu, click the Apply Current View to Other Mail Folders... option.
4. Select specific folders to apply the view or select the Apply view to subfolders check box to apply the view to all subfolders, then click OK.

 Another method is to reset the views completely, by running:

outlook.exe /cleanviews