The rumor of a Microsoft and Research In Motion deal is circling back around. New chatter suggests Microsoft is prepared to make a $3.5 billion investment in Research in Motion, according to sources. Apparently, the two companies have been frequently mentioned in potential deals over the past few months.

AOL’s announced sale of 800 patents to Microsoft on Monday, raised interest in RIMM’s patent portfolio. Neither party would comment on the rumor. We’ll keep you updated should any other news arise.

via Benzinga