I was able to save all my old emails in a store folder, using Outlook Express 6,  I used on XP, after a few formats I was able to change the store folder back easily, Vista doesnt allow you to share a full folder, but it still lets you move folders, I had to accept it,
Ive just installed office 2007 and the outlook office is very different and I cant find the change store folder option, is there one.
thanks.

Outlook (upto 2003 at least) uses PST files (a sort of database).

Outlook Express uses a directory/file structure.