Microsoft Chief Executive Steve Ballmer said on Tuesday the company sees growth opportunities in emerging countries and the shift to digital advertising.

At the company's annual shareholder meeting, Ballmer said Microsoft's sales in "BRIC" countries -- Brazil, Russia, India and China -- will grow to almost $3 billion in fiscal 2008 ending in June from about $1 billion three years ago.

It is still only a small percentage of Microsoft's estimated total revenue of close to $60 billion this year, but the company is working to increase revenue in those countries with new business models and better piracy control measures.

Ballmer reiterated the company's goal to be an advertising "powerhouse," saying that the $600 billion market for global advertising is moving to digital formats.