[Matt OS X]

I'm alittle confused with .mac from System Preference (Image below)

My question is why am I seeing 4 different lists of my accounts with different dates even though I have 1 .mac membership.

I'm afraid to click the "unregister" button because I'm not sure what will happens next? I just want to clean it up and have one .mac membership account on the list instead 4. how can I? and what is the "Unregistered" button is for??

[Barry]

you can delete all excpet the one that says iMac G5 (this computer). You have the others because at some time you must have chaged the name of your computer or plugged in a bootbale external disk and synced that. You can sync more that one computer/device , that is why the list.