I am also looking for the search folders - especially the predefined search for unread emails. As someone else said, this is really needed for dealing with multiple email accounts and high email volume. I am commenting here on the hope that if anyone on the product team responds with a useful response, that I'll see it.
FYI - I tried the new outlook several times, and have gone back to the "old" version every time - and every time I tried to communicate with MS via the help menu.
Perhaps MS has a different process they are unveiling for handling the same organizing issue. If so, will somebody from the product management team please reply and let us know.
Meanwhile, DO NOT force us to use the new version - until you fix this feature-lack