BlackBerry maker Research In Motion reported weaker quarterly profit and an outlook that fell short of analyst expectations on Thursday, sending its shares down almost 10 percent in after-hours trading.

RIM earned $475.6 million, or 83 cents a share, in the three months ended August 29. That was down from a profit of $495.5 million, or 86 cents, a year earlier.

Revenue rose to $3.53 billion from $2.58 billion a year earlier.

On average, analysts were expecting a profit of $1 a share on revenue of $3.63 billion, according to Reuters Estimates.

The company said that for its current quarter ending November 28, it expects revenue of between $3.6 billion and $3.85 billion and a profit of between $1 and $1.08 per share.

For the current quarter, analysts had expected the company to earn $1.05 a share on revenue of $3.9 billion.

RIM's shares fell to $75.10 in after-hours trading, down from their regular-session close of $83.06 on the Nasdaq market.

(Reporting by Wojtek Dabrowski; editing by Frank McGurty)