Once we have Windows XP installed, it's not difficult to open Outlook Express and drag and drop 
the email messages into the application.  If you use custom folders for 
your email, you will have to recreate those in Outlook Express first though. 
    If you intend to use Windows Mail for XP, ignore the above instructions. 
What you'll need to do is first go to 'file/export' in Vista's Windows Mail, 
then choose to export to  'Microsoft Windows Live Mail' format. Pick 
a location for the exported files on a USB drive or separate  drive 
letter as instructed above. Once Windows XP and Windows Live Mail for XP are installed, just open the file menu, 
click 'import' and follow the instructions.  Not a problem!
   To back up contact information we'll use 
the contact application built into Vista which conveniently centralizes all contact details into one location. 
To export contacts and addresses, open the Vista start menu, go to 'all programs' then 'Windows contacts'.Click 
'export' on the toolbar and choose the .CSV (Comma 
Separated  Values) format. Click 'export' then choose a location for the 
file that will represent your contact data set.
  As with your 
email  backup, this should be saved onto a separate logical hard 
drive or removable media like a USB flash drive.

         If you can't see the 'Export' option on the toolbar 
don't worry. On half the systems PCSTATS tested, the option wasn't visible 
because Windows         Vista thought this 
folder  was for some other kind of data, like music, photos or 
video files. To correct  this so we can export your contacts, hit 
the "Alt" button to reveal the file menu, then go to View > "Customize This 
Folder."
 
    
   Under the "Customize" tab change the option for "What kind of folder do you want" from whatever it is currently set to, 
to  "Contacts". Click "apply" and "OK". After that is done you will see 
all your contacts details  listed, and export / import  options located along 
the far right of the menu bar (just above the red arrow in the image 
below).
 
  
Once you have Windows XP installed, open up Outlook Express and go to 'file/import'. Choose 'other address 
book'  then ensure that the 'file type' drop down box is 
set to '.csv'. Browse to the location  of your backed up address book, select 
it and hit 'ok' to import your contact details and email addresses. 
                 
     We're just about ready to begin, but 
before we guide you through the process  of wiping any trace of Windows Vista from 
you're PC there is still one more very important step to take.