Shares of Research In Motion Ltd. fell sharply in after-hours trading on Thursday.

The drop came after the Waterloo, Ont.-based maker of the Blackberry smartphone reported a weaker-than-expected forecast for sales in the current quarter.

Research in Motion updated its line of Blackberry smartphones this year. 

Research in Motion updated its line of Blackberry smartphones this year. (Adrian Wyld/Canadian Press)

The company said sales in the period ending Nov. 28 will be $3.6 billion to $3.85 billion US. RIM also reported lower profits Thursday.

The company earned $475.6 million, or 83 cents per diluted share, for the three months to Aug. 29. That compared with a profit of $495.5 million, or 86 cents per diluted share, a year earlier.

Revenue for the quarter totalled $3.53 billion, up from $2.58 billion. RIM attributed the drop to the costs of settling a patent dispute with Visto Corp.

Revenue rose 37 per cent to $3.53 billion from $2.58 billion. The company added about 3.8 million net new BlackBerry accounts in the quarter, bringing its total subscribers to about 32 million.

"We are pleased to report a strong second quarter with excellent financial performance, successful product launches and accelerating growth in international markets and new market segments," co-chief executive officer Jim Balsillie said in a statement.

RIM's price has risen nearly 19 per cent since July, in part because the company has updated its line of Blackberrys.