Ahead of its earnings report tomorrow, Microsoft announced tonight that it has acquired a $240-million stake in online social networking site Facebook. The software giant is looking to expand its advertising base, and will now become Facebook's sole ad platform partner.

Speaking of earnings, Brian White of BloggingStocks.com offered up a quick look at the software giant ahead of tomorrow's release. Mr. White notes that analysts' predictions are centered on better-than-expected PC sales on a global basis plus the uber-successful launch of Microsoft's Halo 3 game for the Xbox 360 console. Sales of the latest Halo offering topped $170 million, outpacing any previous game or even film, Brian noted.

However, options players seem to be betting against MSFT this time around. The stock's Schaeffer's put/call open interest ratio (SOIR) of 0.64 ranks above 93% of all those taken during the past year. These lowered expectations could be a boon to shares of the Redmond, Washington-based firm, which is currently struggling to hold support at the 31 level.