New NPD Group figures indicate that US Mac sales were up 22 percent in July and August, according to Piper Jaffray analyst Gene Munster. Munster attributes the growth to a month of OS X Lion being available, and recent updates of the Mac mini and MacBook Air. Because the sales rush is expected to subside in September, Munster is leaving a quarterly total estimate of 4.4 to 4.6 million Macs intact. Wall Street consensus is roughly 4.5 million.
