SEATTLE — Microsoft Corp. said Thursday its fiscal fourth-quarter profit jumped 42 percent, helped by strong sales of its Office and Windows software, but investors sent shares down on disappointing first-quarter guidance. Earnings for the three months ended June 30 rose to $4.3 billion, or 46 cents per share, but that missed Wall Street’s expectations by a penny per share. In the year-ago quarter, Microsoft reported earnings of $3.0 billion, or 31 cents per share.

Revenue increased 18 percent to nearly $15.8 billion from $13.4 billion last year, just ahead of Wall Street’s average forecast of $15.65 billion, according to a Thomson Financial survey.