Microsoft Steps Into  Ring The launch of the Microsoft digital-music store takes direct aim at Apple Computer's dominant iTunes service, setting off a battle of the bands between the online music sellers and their rock-star frontmen -- Bill Gates and Steve Jobs. &lt;BR&gt;&lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-The Washington Post&lt;/B&gt;&lt;/FONT&gt;