Windows 7 has taken some heat for aping a few Mac OS UI features, but it's certainly not a copycat OS—something Microsoft Partner Group Manager Simon Aldous might not know, given his recent quote.
Aldous is not a designer or developer, but works with Microsoft partners—sales, essentially. But his quotes are pretty odd despite their authoritative tone. Check it:
What we've tried to do with Windows 7 – whether it's traditional format or in a touch format – is create a Mac look and feel in terms of graphics.
Windows 7 and Snow Leopard may have some similarities in UI, but certainly not in graphical design—Windows 7's airy, sky-blue aesthetic makes liberal use of transparency effects, while Snow Leopard dials back OS X to a more slick, grey-scale efficient look that matches its hardware design. Yeah, the Windows 7 Start Bar is inspired by the Mac Dock, but even they don't look anything alike. Then there's this: