Well, following an amazing pattern of not supporting devices and services in Media Center upgrades the Xbox v1 Extender and HP/Linksys will not be compatible with Windows Vista. Newer Extender models will appear with the Windows Vista release.
“Except for Xbox 360,
earlier versions of Windows Media Extenders are not compatible with
Windows Vista. However, new Extender devices will be available with the
release of Window Vista.” -Microsoft
Update: It appears their might be a slight hope for Linksys/HP Extenders as we go on. Xbox v1 Extenders still appear to be non-supported.
Update 2: People seem to be misinterpreting information here, which lead to the update above. No go for anything but Xbox 360 support in Vista
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