Microsoft’s post-Windows operating system, code-named “Midori,” elicited some interesting responses — and a few potential new clues over the past week.

Windows “Vienna” (formerly known as Blackcomb) is a codename for a future version of Microsoft Windows, originally announced in February 2000, but has since been subject to major delays and rescheduling. Microsoft now announced it will be released in 2009, and according to a magazine called “Smart Computing ...