Is it actually wrong to say "more importantly" ?<br/>For example<br/><br/>"Much is at stake. Last year, the overseas revenue surpassed domestic sales. But <b><u>m</u></b><u>ore</u> important, overseas sales<br/><br/>are growing even though the slowing economy is damping sales back home"<br/><br/>Can we substitute "more important" with "more importantly" ?