"Toronto Maple Leafs" is a proper name, and there are no rules for names (as in Tolkien's "elfs" instead of "elves"). The plural of "mouse", either the animal or the gadget, is "mice". Cheers!
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That's incorrect. The plural of the name of the hardware used to move the pointer on a computer screen is not mice. No one, not even the inventor of the mouse, agrees on the proper terminology for the plural name of this device. Thus, many companies, such as Microsoft, use the term "Mouse devices", not "Mice".