Norah O'Donnell is going back to 'CBS Mornings.' Career experts say boomerangs come with baggage.

Norah O'Donnell is returning to "CBS Mornings" after seven years away as an evening show anchor.Dimitrios Kambouris/Getty ImagesNorah O'Donnell is returning to "CBS Mornings" after seven years away.Returnees are often brought back to revive a struggling project.Career experts advise that those returning to a former job treat the position as a brand-new one.Norah O'Donnell is returning to "CBS Mornings" seven years after leaving the program, and career experts say her comeback offers lessons for