Does Microsoft Office Lock-in Cost the UK Government £500 Million?

In may last column, I wrote about Microsoft's efforts last year to derail any possible adoption of ODF. That's very telling, because in a way it's quite separate from the issue of open standards, and it shows that one of Microsoft's chief fears is losing the extremely lucrative office suite business. But just how lucrative is it? An email from Microsoft that is apparently circulating around the Treasury department sheds some interesting light on this. Here's what it says:

On Open Enterprise blog.