I am using office express 2003 and have switched to 2007. How can I transfer my old e-mails over to 2007?

Answer 1

If you mean transferring Outlook Express information to the full version of Outlook 2007 (in the Office 2007 suite) then Microsoft has instructions here:

http://office.microsoft.com/en-us/outlook/HA010943871033.aspx

Answer 2

File > Import
If the Office 2003 folder was not there, you need to export from office 2003 to a file first, then import using office 2007.