Mac, which currently sits at about 8.2% share, had a weensy wee bit more at one stage, when both the novelty of the MacIntel push and the Vista misinformation were at their heights.
Mac share was around 8% last year, it's closer to 10% now. Their laptop share has has been growing at phenomenal rates and with huge numbers of college aged and high school kids using Macs, once those people hit the workforce you're going to see more and more Apple products hitting business shelves and home desktops. Some analysts even peg Apples U.S. market share at up to 20%. While Microsoft certainly is still holding ground for the business sector, and accounts for a huge margin of their market share, Apple's home products have been growing and Vista's bad rep has helped that. As Mac continues to catch on you're going to see it transfer over to the office space more and more.