Microsoft Corp. said Thursday its fiscal second-quarter profit topped analysts' expectations and climbed 79 per cent, buoyed by rising sales of Windows-based personal computers.

For the quarter ended Dec. 31, profit increased to $4.71 billion US, or 50 cents a share, from $2.63 billion, or 26 cents a share in the same period last year.

Microsoft 3-month chartMicrosoft 3-month chart

Analysts polled by Thomson Financial had forecast a profit of 46
cents a share.

Revenue at the company rose 31 per cent to $16.37 billion from $12.5 billion in the year-ago quarter, ahead of analysts' prediction of $15.95 billion in sales.

The quarter was particularly strong when compared with a year ago, when Microsoft deferred more than $1 billion in revenue due to delays in getting Windows Vista, its newest operating system, to consumers.

Microsoft's "client" division, responsible for Vista, posted revenue of $4.34 billion. The business division, which includes Office, brought in $4.81 billion in sales.

Stronger-than-expected PC sales in the second quarter — 13.1 per cent compared with last year, according to research group Gartner Inc. — helped both divisions.

Shares of Microsoft rose $1.40, more than four per cent, in extended trading, after gaining $1.32, or four per cent, to close the regular session on the Nasdaq market at $33.25.