Microsoft Outlook users rely on the information that is saved within their Outlook folders. By default, Microsoft Outlook stores all of your personal Outlook data in what's called a PST file. This data includes your Inbox, Outbox, Calendar, Contacts, Tasks, etc. Usually the PST file is known as Personal Folders within your Outlook Folder List, but you can also have extra PST files that are used for things like archiving or just simply to keep a separate Outlook database.
Backing up your Outlook Personal Folders is a crucial step to avoid losing such valuable data. Furthermore, backing up your Outlook data is simple and while most people don't realize it, Microsoft provides a free program designed specifically for backing up your Outlook information called the “Microsoft Personal Folders Backup”. The Microsoft Personal Folders Backup application makes it easy to backup your Outlook PST file(s) in case of an emergency.
*Note: If you choose to validate Office (recommended), you may have to install the ActiveX Control before installing the Genuine Office Validation Component.
You can view previous backups by clicking on Open Backup… in the Outlook Personal Folders Backup dialog box. Also, once a backup is complete, you can view it by going to a specific backup file's location using Internet Explorer. Or, you can copy the completed backup to a removable media, such as a CD, DVD or portable hard drive.
Microsoft Exchange Server: