Research in Motion Ltd. volatility up prior to unconfirmed Microsoft Corp. buyout chatter. RIMM is recently trading up $1.33 cents to $83.11 on unconfirmed speculation MSFT is considering the purchase of RIMM on rumor of Google Inc. introducing GPhone. RIMM has a market cap of $45 billion. MSFT has a market cap of $267 billion. RIMM is expected to report EPS on October 4. RIMM September option implied volatility of 47 is above its 26-week average of 42 according to Track Data, suggesting larger risk.