Few days ago one of the newest Microsoft products came up to our laboratory. Optical mouse - Intelli Mouse Explorer 4. 4.0 series theoretically is supposed to replace the famous and appreciated 3, but the time will tell. 3.0 series was definitely the favourite one of those who play FPP games. The mouse had a great optics, fit the hand well and maybe its design was not very sophisticated, yet it managed to gain many admirers. 4.0 series is supposed to be better and more comfortable. is it like this? I will try to answer it in the following review