Browsers on Windows RT: It's a tough antitrust case to make
Five browser logos  It's a good thing legal action is Mozilla's
"last resort" for resolving its disagreement with Microsoft over
bringing Firefox to the upcoming Windows RT, because it's likely
a difficult antitrust case to make.  That's because Windows RT,
the version of the operating system geared for devices using ARM
processors, is a different beast than conventional Windows
running on traditional x86 processors. Microsoft's present rules
would hobble non-IE browsers on Windows RT, but the company's
market power is with Windows on x86 chips.  ARM chips dominate
today's smartphone and tablet devices running Apple's iOS,
Google's Android, and Microsoft's Windows Phone 7.x, but they're
very much unproven when it comes to running the version of
Windows for PCs.  "To bring a monopoly claim, not only would you
have to show that Microsoft does have power, but also that it's
foreclosing a significant portion of the market," said Joel
Grosberg, an attor