Outlook 2010 Backup your emails
Backup your emails in Outlook 2010
To backup your email follow these steps:
Go to File → Open → Import.
Select Export to a file.
Select Outlook Data File(.pst).
Select the folder to export from.
Choose the destination where you want the backup file to be saved.
Optionally enter a password to secure the backup file.
And your email and contacts are backed up
Outlook 2003 Backup your emails
Back up Outlook data with the Microsoft Outlook Personal Folders