Restoring your backed up data in Outlook is one of the most needed processes because quite often when you change service providers the new server will have no emails on it and when you synchronise all your existing emails on you PC and phone will be deleted as you log into the new server through the process of synchronisation. NB for this to work you should do a backup of your email accounts before syncing to the new server!
Open Outlook. Click File and then Open and Export.
Select Import from another program or file then click Next.
Select Outlook Data File and click Next.
Click Browse and navigate to your backed up file. Click Next.
If you created a password to use for your backup file enter it in the text box provided and click OK.
Select the folders you would like to restore and which folder you would like to restore them to and click Finish.
Your email's will be restored back to your selected folder.