Why ActiveSync?
From my experience with ActiveSync in my $DAYJOB's IT shop, I'd have to say it's a nightmare for system administrators; the version that came with our CEO's "smart"phone (and I use the term "smart" in the Marketing sense - it's certainly an idiotic design) required the user to have local administrative rights before it would allow him to sync. It also frequently disabled itself, requiring a reinstall.
Xandros may well find this puts them in a more competitive position vis-a-vis Microsoft shops, but they won't be getting in here. It's bad enough having the "real" MS wares; we don't need a knockoff of that crap as a replacement.