I emailed someone who had been complaining about Vista online, asking why he said that "Vista activation and validation is a nightmare for PCs that we support on government networks. The EULA clause on remote disabling of functionality is a major issue too."
I am a manager at a subsidiary company of the Malaysian Sapura group, focused on government and defence sector. We supply systems such as military flight simulators which for security reasons cannot be connected to the Internet. The Malaysian government has good relations with the USA, but as a Muslim country, has to be sensitive to a possible future change of status.
I presume that there must be versions of Vista without the remote disabling feature for the US government as I cannot imagine them accepting that situation."
Thinking about it, it's hard to see how you could certify Vista for any mission critical situation when its functionality is dependent on an external process over which you have no control -- indeed, no information at all. Modern, complex operating systems are very hard to properly characterise at the best of times, but how do you cope with that?
Definitely something we'll be keeping an eye on, and another one for the list of ways in which DRM and its ilk harm the market far more than they protect the supplier.