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What is the difference between the MS Intellimouse Explorer 4.0 and the 4.0A?

the 4.0a fixed the defect from 4.0 as well as some other small mods.

The 4.0 tended to have wiring come loose interally and just stop working at random.

I went through 5 of them in 2 years (on 3 PCs, bought 3 new at the same time, did 5 total RMAs, the only ones i have working were 4.0s that were replaced with 4.0a models)
 
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