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Apple's Mac sales down in July, to slide 5 percent this quarter

Macs appear to be getting hit hard by iPad cannibalization, as well as continued weakness in the PC market.

CBS Interactive

Apple's Mac sales had a rough July, new data from research firm NPD shows.

Mac sales in the U.S. were down in July and are expected to drop 5 percent year over year in the company's current fiscal quarter that ends in late September, the research firm revealed on Monday in data obtained by All Things Digital.

That Mac sales are expected to slide this quarter is just the latest dose of bad news for Apple's computer line. In the company's last-reported quarter ended June, domestic Mac sales were also down 5 percent.

Macs are suffering the same troubles as Windows-based PCs, which have seen their shipments decline sharply as consumers and enterprise customers increasingly turn to tablets for their computing needs. Apple has touted its ability to overcome some of those trends, but as of late, the company is having difficulty in that effort.

Apple's own success might be causing it even more trouble. According to All Things Digital, NPD believes that the iPad's success is cannibalizing Mac sales to some degree.