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Title: Very disappointing
Review: I purchased the Microsoft trackball in late August '01. Within 2 weeks it was beginning to show problems, and then quit working. It would move horizontally, but not up or down. I tried to clean it in hopes of solving the problem, no luck. I'm going to return it. My son had one these mice, same result. I'm an admitted Microsoft junkie, this was very disappointing, save your money.
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