Shares of Microsoft Corp. MSFT, -0.70% fell 0.8% in afternoon trading, putting them on track to fight off a break of the closely watched 200-day moving average for the second-straight day. The 200-DMA, which many chart watchers see as a dividing line between longer-term uptrends and downtrends, rose to $292.94 on Tuesday, or 1.2% below the previous session's close, from $292.78 on Monday.