MCI) shares plunged almost 16% after the high-performance server producer reported preliminary results for the fiscal third quarter below its earlier guidance. The company now expects revenue for fiscal Q3, which ended March 31, in the range of $4.5 billion to $4.6 billion, down from its earlier guidance of $5 billion to $6 billion and about $1 billion below estimates of $5.5 billion at the midpoint. 