Microsoft (MSFT) shares fell after revenue projections came in weaker than expected. The software maker said it expects currency exchange to reduce first-quarter and second-quarter sales by 5%. Stocks were suffering another day in the red tied to disappointing earnings. Apple (AAPL) weighed heavily on the Dow, while the Nasdaq took a hit on Microsoft. Crude oil fell below $50 a barrel as weekly inventories unexpectedly rose. Crude stocks rose by 2.5 million barrels last week. Existing home sales in the U.S. rose at their fastest pace in June since 2007. The measure increased 3.2%, above economists' estimates. Thoratec (THOR) surged on news St. Jude Medical (STJ) would acquire the medical equipment developer for a total $3.4 billion.