how to make BT internet her default email account.
Windows Live email.
IF it was Microsoft office Outlook or Outlook Express then you can use Microsoft "windows Easy transfer" program to move Outlook settings and mail plus your documents and other user data to the new computer. The program can be downloaded from here http://go.microsoft.com/fwlink/?LinkId=160881. Windows Easy Transfer wont move passwords so you will need to remember them or reset them if forgotten.