]I believe I mentioned this . . . and then asked : Will ALL the contacts be removed if I delete SKYPE's plist?
Anyone know for sure?
There are several factors at work here that would make the consistency of such behavior very questionable between two different users, so take any hard answer to that question with a grain of salt. The best way to know is to try it yourself.
Please keep in mind, the OS WILL FIGHT YOU on this, thanks to cfprefsd. It runs in the background and caches plist data. It won't normally cache data you haven't accessed SINCE RESTART (not since login! SINCE RESTART! it stays running and caches it across sessions!) Normally it loads data on first app launch after restart, so the easiest way to make sure it's not getting in your business is to restart and not launch the app before you move or dump its plist. Unfortunately, Skype has a service that loads when you login, to put the widget up in the menubar, so cfprefs may already have its claws in the plist by the time you see your desktop.
In this case, I would only completely trust a reboot into another user account (or single user mode) to go fish out that plist.