What? Why even mention windows here, these two OS's aren't even close to being in the same category other than they share the price tag of "free". I'd like to see windows try to run in under 128mb let alone the 1mb for linux or the mere kilobytes need for Contiki. A windows mention here seems very out of place.
CE has become Windows Embedded Compact; and there is a Windows Embedded Standard as well (stripped down components of the desktop OS, if I recall).