Just thinking about it, I only see two ways in which that would change the stocks valuation. On the one hand, it must reduce the capital that Microsoft has on hand, which might reduce the price of the stock. On the other hand, I would imagine that the fact that owning Microsoft gives you real value in the form of an (quarterly?) payout might increase the stock's price. One can still buy and sell the stock just like a stock that doesn't pay a dividend, betting on the future success of the company, plus you get money on a regular basis. Is there some other way it relates? I really don't know much about this.