Research In Motion's (NASDAQ:RIMM) stock enjoyed a boost after investment bank Goldman Sachs upgraded the stock from "neutral" to "buy," bullish on the prospects of RIM's forthcoming BlackBerry 10 platform. RIM's stock climbed close to 10 percent this morning. RIM's stock has surged 42 percent in the past month as a growing number of financial analysts have expressed slightly more optimistic views about BB10. "We now assess a 30 percent chance of success for BB10 given positive early reviews, broad-based carrier support, attractive features, and interest by carriers and consumers in broadening the field beyond Android/iOS," Goldman analyst Simona Jankowski wrote in a research report today. However, not all analysts are positive: Earlier this week Morgan Stanley analyst Ehud Gelblum threw cold water on RIM's rise. RIM plans to fully unveil BB10 Jan. 30. Article