The world's largest software maker said net income for the period ended in March dropped to $4.38 billion, or 47 cents a share, from $4.93 billion, or 50 cents a share in the same quarter a year earlier.
Microsoft said revenue in the quarter rose to $14.45 billion from $14.39 billion.
Analysts at FactSet Research had estimated Microsoft would post earnings of 45 cents a share and $14.57 billion in revenue.
Looking ahead, Microsoft projected earnings per share in its 2009 fiscal year starting in July to be between $2.13 to $2.19 per share compared to an earlier forecast of $1.86 to $1.89 per share. Revenue estimations are in the range of $66.9 billion to $68.0 billion for 2009.
The Redmond, Wash- based company released results just two days ahead of a deadline set by Chief Executive Steve Ballmer for Yahoo's board to accept Microsoft's $44.1 billion unsolicited takeover bid. If Yahoo does not respond, Microsoft said they will face a proxy fight. Some analysts believe that Microsoft may have to raise its offer in order to complete the deal.