As in such cases, mileage may vary: Tekserve, for example, was upgrading new systems that lacked the digital detritus that accumulates on well-used Macs.

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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in Computerworld's Mac OS X Topic Center.