View any two Outlook folders at the same time

If you want to see another Outlook folder, such as Calendar, without switching away from one that you already have open, such as Inbox, follow this procedure:

If one of the two folders is not already open in the main Outlook window, on the Go menu, click Folder List, and then click the folder to display it.
Right-click a second folder that you want to display, and then click Open in New Window on the shortcut menu.