Shares of Microsoft Corp. MSFT, +0.20% sank 2.5% in premarket trading Thursday, after the software behemoth lowered its fiscal fourth-quarter guidance for profit and revenue to reflect and "unfavorable" currency impact. The company revised its earnings-per-share estimate for the quarter to June 30 to $2.24 to $2.32 from $2.28 from $2.35, with the new guidance below the FactSet EPS consensus of $2.33.