I don't think so, the Aero look and feel was out (in Longhorn betas) way before KDE4 came to be... But perhaps the Windows 7 look was influenced by it. However

I don't think so, the Aero look and feel was out (in Longhorn betas) way before KDE4 came to be... But perhaps the Windows 7 look was influenced by it. However, the current look of KDE - which is much more like Aero - is very recent, at least post Windows 8. KDE4 as it was at the beginning didn't look like Aero that much IMHO.