Market researcher IDC expects to announce within weeks that Linux" PC market share in 2003 hit 3.2%, overtaking Apple Computer Inc."s Macintosh software (as reported a few weeks ago it has fallen at 1.8%, for the first time). And the researcher expects Linux to capture 6% of this market by 2007. That"s still tiny compared with Microsoft"s 94% share. Desktop Linux hasn"t had any appreciable effect on Microsoft"s finances yet, but it could do damage if Linux manages to grab a 10% share of the market, say analysts. IDC estimates that desktop Windows" share will shrink slightly, to 92% in 2007 as Linux" share doubles. The first big question though is how all this will have an effect to Apple"s business.