Apple's Mac sales continue to come in flat year over year, according to a new report from Piper Jaffray analyst Gene Munster who looked at July data from market research firm NPD. Based on the data, he maintains his outlook of a 5% year over year drop in Mac sales for the September quarter and continues to note that Mac sales are becoming less significant in light of iPhone and iPad sales, representing just 15% of Apple's total revenue. As with his previous reports, Munster notes that it remains difficult to extrapolate NPD data to Apple's global sales performance, but he views the July data as “neutral to slight positive,” down from slightly negative in a June report.O
