File shares will not exist forever. Microsoft will eventually stop supporting them. It is important that IT departments begin reviewing the objects from the “bottom up” (file to folder to sub directory to directory) yesterday. Information management professionals know best how to apply a set of internal (user-driven) and external (records retention schedule) criteria to determine what objects stay where they are, what objects move to other locations or custodians, and what objects are deleted.
CIO be wary: this is not a four month project.