Thanks guys for all the helpful responses - job for the weekend. I like to understand the process and where things are going/how they work rather than using the migration wizard so that is why I've avoided it. On reflection migrating to a Mac is a bit of a red herring as I'd have the same question moving to another PC!

And I'm afraid the last couple of posters misunderstand the tyranny to which I rebel - it is not the evil of Microsoft, IBM or others but rather the corporate straightjacket I've faced from working for some of the world's largest professional services firms for the last 20 years where choice is largely banned and you are stuck with the kit you are given. The tyranny is my lack of ability to express choice, not the choice I make!