Dow Jones Industrial Average rallied on Friday on as investors continued to prize global central banks' pledge to support slowing economy. Blue chip index advanced 0.91% or 115.26 points and closed at 12,767.17. Microsoft rose added 2.3%, after reports that the firm is in talks to acquire Yammer, a developer of social networks within enterprises. Bank of America posted a 3.1% gain, most in the Dow index. On weekly basis index has appreciated 0.9%.