Outlook initially opens up with both the Outlook
Bar and the Folder List displayed. To navigate to an
Outlook folder, you simply click on the icon for that folder in either one
of them.
You may leave both of them active, but they largely duplicate each
other so it's advisable to turn one of them off.
Which do you turn off? You make the call. You can get to more places by
using the Folder List, but some people use the Outlook Bar because it
looks a little better.