Research in Motion CEO Jim Balsillie said he is not worried about Microsoft's latest push (pardon the pun) into the mobile email space. With the latest service pack, Microsoft now offers native push email in the Windows Mobile operating system. Readers may recall that RIM is similarly not worried about Nokia's recent acquisition of Intellisync or about the chance that its email service could be shut off by a US judge. Seems like RIM has an awful lot not to be worried about these days. Article | Analysis