Microsoft Shareholders OK \$3 Dividend  BELLEVUE, Wash. (Reuters) - Microsoft Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=MSFT.O target=/stocks/quickinfo/fullquote"&gt;MSFT.O&lt;/A&gt;  shareholders on Tuesday approved changes to its stock-based  employee compensation plans that would maintain the value of  stock options and awards, allowing the software giant to go  forward with a planned \$3-per-share special dividend.