Update: Looks like Vidabox spoke too soon. Their press release neglected to mention that they have yet to receive a Microsoft license to enable CableCARD support in their box (which also leaves us wondering whether they received CableLABS certification, or if they're building that aspect of the process into their launch date). Either way, We're a little sketched that they'd announce before approval; we'll let you know what turns up.
Update 2: We heard back from Vidabox, they claim that they "are indeed receiving Microsoft licenses to enable CableCARD support in our VidaBox media centers" and that "the bottom line is that our VidaBox systems that will be released in March are fully licensed with Vista Ultimate & certified for CableCARD." Sounds like some licensor / licensee he said she said, but until Vidabox can confirm their license to vend CableCARD Vista boxes we may be inclined to take the word of the project manager in Microsoft's Windows group that contacted us. Either way, we'll let ya know.