I am sorry but I think you are thinking of this a little too simply. I am moving my emails from one computer to another, not through a network or any other device. I have to take my emails from one computer, place them on some storage media, then import them onto the other computer.
I have tried exporting from the Vista Mail program, it has 2 options for the export format being Windows Mail 7 or Microsoft Exchange. When exporting to Windows Mail 7 format, Outlook on the XP computer does not recognise this format, so using this is useless to me. When I export from Vista's mail program to Microsoft Exchange format (which Outlook for XP will accept) I get the error message "The export could not be performed. An error occured while initialising MAPI".
Put simply, the export feature does not work for me. I am asking if there are other options out there or if I can fix this error that is occuring so that I can export in the Microsft Exchange format. I could in the past when moving from one computer to another just go in and copy the relevant files for the Inbox, Drafts etc from one computer to the other, Vista doesn't seem to allow this to happen as it saves all of its emails in a different format, a single file for each item rather then having all emails for a particular folder in one file. As the older version doesn't save it's emails in a single file for each mail format I can't just copy from one program to the other.