Microsoft Corp's quarterly adjusted profit missed analysts' estimates as a continued slump in personal computer sales hurt the company's core Windows business, sending its shares down 4 percent in extended trading.

The company's net income fell to $3.76 billion USD, or 47 cents per share, in the third quarter ended March 31, from $4.99 billion, or 61 cents per share, a year earlier.

Revenue fell to $20.53 billion from $21.73 billion.

Adjusted revenue rose to $22.08 billion from $21.73 billion.

Excluding one-time items, Microsoft earned 62 cents per share. Analysts on average had expected a profit of 64 cents per share on revenue of $22.09 billion, according to Reuters.

Revenue in Microsoft's "intelligent cloud" business, which includes the Azure cloud infrastructure and services business as well as products such as server software, rose 3.3 percent to $6.1 billion in the quarter.

Chief Executive Satya Nadella has focused on developing the company's cloud business with his "mobile first, cloud first" strategy, since taking over in early 2014.

Windows OEM revenue declined 2 percent in constant currency.

Worldwide PC shipments fell 11.5 percent in the first quarter, according to research firm IDC.