PSTSync   
http://www.aminsoft.com

PSTSync is the worlds best selling Microsoft Outlook synchronization utility. No other tool on the market offers the robustness and flexibility of PSTSync. PSTSync provides bi-directional folder synchronization as well as powerful SmartMove and SmartCopy functions where users can synchronize, move or copy each and every Outlook mail folder, including custom created folders without having to have open Outlook! Synchronization's can be automated with built in Scheduling functionality. PSTSync offers accurate and secure 128 Bit PST file encryption and decryption using RSA algorithms for locking your data from prying eyes. For users who might find encryption a little intimidating, PSTSync also offers password protection for adding a password to a PST file. Bloated PST file will become more manageable by using the specifically designed PST File Compression tool to put your PST file on a diet! Users will also benefit from backing up their PST files to an online location for safe archiving. PSTSync also offers a built-in file viewer to view your PST files. Users will be able to crack open a PST file to view the emails, contacts, notes and any other Outlook folder all within PSTSync, no need to open it up in outlook. The new version includes the following features - New Synchronization engine, SQLLite database, Save/Load pages and profiles, true conflict resolution (automatic or manual) and many more.

Right Email Backup   
http://www.rightfiles.com

Right Email Backup designed to protect important information stored inside your email program from loss. It creates reserve copy of everything on time you want. Use it to backup business correspondence, partners and clients contacts, important letters, attached files as well as local email software settings - accounts, signatures, address book, message rules and blocked senders lists. It works as hidden agent and you would never need it until you want to restore something in your email program. You can save reserve copy anywhere you like - on the same computer, network, or CD. Strong file encryption methods allow to protect reserve copies from unauthorized access with a password. Right Email Backup can be used with any popular email program: Outlook Express, MS Outlook, Eudora, Netscape Messenger, IncrediMail, PocoMail, The Bat!, and Opera Mail. It ensures safe moving of your email base and email program in the case if you need to change computer. Just save everything into one backup file and restore at another desktop PC or laptop. Use it also to synchronize your laptop and desktop email base.

EZ Outlook Backup Basic   
http://www.rinjanisoft.com

EZ Outlook Backup Basic makes it easy to backup your Outlook mail and contacts to a ZIP archive and works with the Windows Task Scheduler to provide an automated backup solution.

EZ Outlook Backup Pro   
http://www.rinjanisoft.com

EZ Outlook Backup Pro makes it easy to backup your Outlook or Outlook Express mail and address book to a ZIP archive or to CD/DVD and works with the Windows Task Scheduler to provide a completely automated backup solution. The wizard interface makes the program incredibly easy to use and a restore utility is included.

Outlook Express Backup Plus   
http://www.staticbackup.com

Outlook Express Backup Plus is most populer backup software to create backup copies of Outlook Express email database. Outlook Express Backup Plus can save emails, address book, settings, mail and news accounts, message rules, blocked senders lists, signatures, IE Settings and Outlook Express Settings to a single, compact, encrypted, compressed backup file that can be easily restored when necessary. The email database can be saved on one computer and restored to another, thus making Outlook Express Backup Plus not just a backup utility but also a synchronization tool. The program is easy to use and has a simplified user interface, using wizard to create a new backup project, very useful for beginners.Outlook Express Backup Plus has command-line interface. You can use it to start backup and/or restore process unattended from any script or batch file.