hedwards: Strictly speaking, didn't they both rip their basic UI from Xerox?
Miaghstir: Xerox didn't think it was worth anything, so Apple got the rights to use it. I think.
I forget how exactly that worked out. But Xerox ended up suing over the issue.
Apple was never a licensee, Xerox filed suit during the proceedings where Apple sued MS over the look and feel issue. Xerox ended up suing because if precedent was going to be set for copyright covering look and feel it felt entitled to money from Apple since there wasn't ever a license involved.
Basically, Xerox let the Apple folks in for research purposes. Which is more or less just as stupid as what you were suggesting.