April Mac sales were comparatively slow, according to new NPD numbers quoted by Piper Jaffray analyst Gene Munster. US sales data shows that units increased by about 9 percent year-over-year. The problem, notes Munster, is that in the same timeframe in 2010, Apple released updated MacBooks which spiked sales. The only Mac notebooks which have been updated in 2011 so far are MacBook Pros.
