Piper Jaffray said today that a 0.5% increase in Mac market share “is not unrealistic” for Apple if the current interest and demand continues for its iPod. “We believe a 0.5% increase in market share, to 2.5%, would have a significant impact on numbers,” the research firm said, increasing calendar 2005 and 2006 Mac sales by 16% and 24%, respectively. “Despite potential supply issues in the Sept. quarter, demand remains strong, and we believe that over the next two years Apple has the ability to grow its market share ahead of expectations. This will be driven by greater-than-expected adoption of iPod/HP iPod, translating to acceleration in sales of Macs.”