MS didn't get GUI from Apple, or steal it, Zerox GAVE it to Bill.

[Perris Calderon]

From Alan Kay:

Alan is quite a man, please read his wiki in that link.

Gates didn't visit Zerox like Steve did, but had an in person professional relationship with Alan:

Alan kay on the subject

I once said to Bill “Bill, we want you take the ideas, but please take the whole idea, don’t make a grotesque caricature of a misunderstood subset”.

Speaking to the interview where gates told Steve something like "it's more like we both broke in..."

Neither broke in, and Bill was given direct permission from Alan Kay, I'll find out from Alan and add in comments and edit to the main body if Alan has a similar anecdote with Steve.