So there used to be someone who used Limewire on their personal computer at my house (local network), even though her computer has not been on my network in quite some time. It still shows up on my iTunes shared list. When I do try to access it, it says a message about not being compatible with this version of iTunes. (I know it has worked with older versions, don't remember what ones though )

Any ideas as to why this would happen?

Edit: I'm on a Mac OS X 10.5.6, I can/will supply logs as requested.

iTunes has a pref to turn off looking for shared folders on the local net. Sounds like the guest's shared folder was cached on you machine. Turning off and on might clear the cache.

A Safe boot and Software Update can hurt either.