iMac Wireless Mouse Click sound

You're welcome. Just had another thought... You could search through different brands of mice for one with a more agreeable sound and then pair that to the Mac.

And then another thought... If you succeeded in getting a silent mouse, then all those web sites would have to come up with a new phrase for where they say "click here" !

No, the sound you are hearing is a mechanical noise made by a small "microswitch" when the switch action is completed. Actually, you could try to find a silent microswitch and then disassemble the mouse, install the new switch and reassemble the mouse. I expect that would be a very difficult exercise.

EDIT: Having once had the actual company named Microswitch as a customer I know that the noise is intentional as confirmation of the switch operation.

:D