STAMFORD, Conn.--(BUSINESS WIRE)--Frontier Communications Corporation (NASDAQ:FTR) announced today that it has commenced registered offerings of $750 million of common stock, par value $0.25 per share, and $1.750 billion of mandatory convertible preferred stock, par value $0.01 per share. Pursuant to the offerings, Frontier intends to grant the underwriters an option to purchase from Frontier up to an additional $75 million of common stock and up to an additional $175 million of mandatory conve