Thanks for your help Tony. The link you gave me didn't yield any results, but I did
manage to find my addresses by following:
C:\users\me\AppData\Local\Microsoft\Windows Mail Directory.
However, the problem now is to get them into Thunderbird that I'm using now.
Cut 'n' paste or drag and drop doesn't seem to work. It looks like I'll have to transfer
them across individually.
(edit: Can't get Windows touch option to work)