In the video below, Motley Fool analyst Andrew Tonner discusses the prospects for Research In Motion (BB 1.82%), maker of the BlackBerry line of mobile handsets.

There have been clear winners and losers in the move to mobile, and RIM has solidly fallen in the latter category. But the company's stock has appreciated an astonishing 67% over the past three months.

With RIM's new BB10 operating system set to launch next year, there's been renewed optimism in the Canadian handset maker. Can RIM's recent rally last? There's two schools of thought. The bull case says RIM can maintain its global market share, now at about 4%.  The bears, however, say RIM has a long track record of botched launches and delays, and investors should expect the same with BB10.

Tonner says investors must be cautious about Research In Motion, especially after its recent rally.

Research In Motion has long watched its once-mighty market share slip away to smartphone manufacturers like Apple (AAPL 0.51%). There's no doubt that Apple is at the center of technology's largest revolution ever, and that longtime shareholders have been handsomely rewarded with over 1,000% gains. However, there is a debate raging as to whether Apple remains a buy. The Motley Fool's senior technology analyst and managing bureau chief, Eric Bleeker, is prepared to fill you in on both reasons to buy and reasons to sell Apple, and what opportunities are left for the company (and your portfolio) going forward. To get instant access to his latest thinking on Apple, simply click here now.