Apple may have users that other computer makers would die for, loyal users that spend money, some times lots of it, but even they draw the line somewhere. "They're very willing customers," Daoud concluded, "but even they are spending money on other devices, like smartphones and tablets."

Apple will disclose its third-quarter Mac sales numbers Oct. 25 during an earnings call with Wall Street analysts.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at , on or subscribe to . His email address is .

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