U.S. stock futures were mixed this morning, with the Dow futures falling around 0.1% on Wednesday.Shares of FedEx Corporation FDX fell sharply in today's pre-market trading following soft first-quarter guidance.FedEx reported fourth-quarter revenue of $22.2 billion, beating analyst estimates of$21.84 billion, according to Benzinga Pro. The company reported fourth-quarter adjusted earnings of $6.07 per share, beating analyst estimates of$5.87 per share.FedEx expects first-quarter adjusted earnings to be be ...