What an awful way to push VDI! It just makes it look like a thin-client replacement or Sun's Global Desktop, and if they sell it like that it will be a great big fail becasue just about no-one wants either of those. Most companies have realised that if you want to make a user truly mobile, give them a laptop. It's simple, it works, and the security issues can be avoided with secure logins, secure VPNs, automatic disk encryption, user education, etc. Laptops are cheap, they don't need oodles of new technology and - unlike the Sun offering - you get to keep all your old Office apps and they work! Even if you lose a few laptops a year, it costs much less to replace them than the license costs for most of these "virtual desktop" solutions.

Where VDI should be pushed is to replace static desktops, not mobile users. It will allow you to thin out their desktops and hopefully lengthen the time between desktop upgrades, allow users to move between desks without haveing to change anything, and yet give centralised control via the datacenter servers holding the image and apps. With fast internal networking this makes sense - trying to do it to mobile devices over even broadband is a joke. A remote user with a laptop is still productive even without a connection into the core - a "virtualised desktop" user without a link is dead in the water.