A roundup of business and financial news breaking before the opening bell on Wall Street.

  U.S. stock futures traded lower on Tuesday, with FedEx’s improved guidance offset by worries over Greece’s credit rating as well as continued fears over Dubai.

  A roundup of the latest corporate earnings reports and what companies are saying about future quarters.

  Stocks in Dubai again slumped on Tuesday, as the debt woes of one of the emirate's key investment companies continued to reverberate.

  Global conglomerate 3M Co. reaffirms its full-year earnings guidance on Tuesday, impliying a weaker-than-expected fourth-quarter profit and disappointing investors.

  The U.S. dollar held its ground versus the euro but slipped versus the Japanese yen Tuesday, holding within recent ranges a day after Federal Reserve Chairman Ben Bernanke appeared to derail expectations the central bank would hike interest rates as early as next year.

  Charles Schwab Corp said on Tuesday that its clients who trade stocks most frequently grew more optimistic about the stock market and the U.S. economic recovery during October.

  Credit-rating agency Moody’s Investor Services warns that the United States and Great Britain may test the boundaries of their Aaa sovereign ratings due to deteriorating public finances.

  FedEx Corp. shares rose in pre-market trades Tuesday after the delivery giant raised its outlook for second-quarter earnings on increased demand for its international services as well as its cost-cutting efforts.

  Oil futures fall below $74 a barrel on Tuesday, as investors await data expected to show increases in U.S. crude and gasoline inventories.