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If your scroll ball is getting grotty, there are ways to clean it out, usually involving compressed air and rolling the mouse upside-down on a sheet of paper. Sadly, after a while it doesn’t do the trick.
If you have AppleCare, they will swap out your mouse for you if it was bought with the machine. They did this for me and I am so happy that my MM is back in action. I love my Mighty Mouse. It is such a beautiful mouse, and it is Bluetooth, so no wires and no dongles.
I am certain that with a wiped-clean install of Leopard on my MBP I had to re-enable the right click button. Perhaps other machines have that on by default, as you said.
ETA: How did I miss out on the kiss? I can’t see how Ice Cream Man slipped in with the MM answer…
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An alcohol swab works very welll to clean the scroll ball - think I got this hint from the online help files by clicking on “Help” and typing something like “stuck scroll wheel”. Since we’ve got a diabetic and an RN in the family, these are pretty readily available around my house, and have always worked for me.
I remember early versions of OSX shipped with right click disabled by default, but I don’t remember having to enable right-click since 10.1 or 10.2. Could be this is persistent across upgrades, but I don’t think I had to do this with my wife’s MacBook Air.
And “Option” almost always does something useful. For example, Option + Clicking on the infamous green button truly maximizes the window to the size of the screen.
Another underdocumented feature is the magnifying tool. If you hold down “Control” while rolling the mouse wheel up, you zoom in on the area surrounding the cursor. On a later model laptop, you can zoom in by holding down “Control” while sliding two fingers up on the trackpad.
And on late model laptops (I think beginning with the introduction of the MacBook and MacBook Pro), two fingers plus a click makes a right click. This even works in Windows running inside Parallels on my MacBook Pro.