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Good day! I am Independent Advisor Paul R. and also a Microsoft/Windows user like you and I am glad to be able to provide assistance to you today. I understand that you are curious with regards to the MS Intellimouse Explorer 3.0.
It looks like it is a genuine product but if you are looking into purchasing a new mouse you can go with the new version of that and you can purchase it online or via a local retail shop.
You can refer to the link below for the new version of it.
https://www.microsoft.com/xx-xx/p/microsoft-cla...
Regards,
Paul R.