Uh, no, they were not. Where do you get your historical factoids? Who do you think made such a request of Microsoft?
Microsoft was contracted by Apple to write a word processor, spreadsheet, and database package for the Macintosh... to do that task they needed access to the Macintosh's code base. While they worked on what became Microsoft Office for Mac (which came out before any such application package for DOS), Microsoft was copying Apple's intellectual property and the result was Windows.
No one "asked" Microsoft to "refine" Apple's or Xerox's Operating systems. They used their unique access to the trade secrets of Apple's intellectual property to steal them. That's why the movie was named "The Pirates of Silicon Valley"! Microsoft did not pay Xerox for any visits to PARC. They did not license the software from Apple. They DID sign a poorly drafted agreement with a former sugar water salesman who was, unfortunately, the CEO of Apple for a license for some of the IP of the GUI of the Mac that was supposed to be limited to Windows 1 through Windows 2, but It was so poorly written that a luddite non-tech knowledgeable judge said the agreement only applied to the TRASH CAN icon and a few minor issues of similar importance when Apple sued over copyright infringement for Windows 95... so Microsoft changed it's trashcan to the Recycle Bin! ... went on its merry way, using Apple's basic designs, upside down and backwards. . . and driving people to tearing their hair out.
Your wrong after Apple got their operating system from Xerox, which was a windows type system they went to Microsoft to get it refined, Which Microsoft kinda borrowed it!