The scroll wheel came late to Macs. In fact, although every version of Mac OS X includes support for a scroll wheel, no Apple mouse has ever had a scroll wheel. The closest they ever came was the scroll ball in the Apple Mighty Mouse.
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We believe in the long term value of Apple hardware. You should be able to use your Apple gear as long as it helps you remain productive and meets your needs, upgrading only as necessary. We want to help maximize the life of your Apple gear.