1)   PSTSync 2.5.1010
PSTSync, the ultimate tool for all of your PST file management. Now you can easily synchronize all of your data the smart way. PSTSync can handle all types of Outlook folders. It keeps all your computers in sync with your PST mail files at all times.

 2)   QSynchronization 2.5.1
QSynchronization is a Microsoft Office Outlook add-in. It synchronizes uni- or bidirectional your Outlook folders on Outlook notebooks or PDA such as contacts, calendars, appointments, tasks, emails with your central Outlook data.

 3)   Dmailer Sync 8
Pc Sync Software: Advanced Pc Sync software that offers a complete data mobility solution to sync Outlook, Outlook Express, Windows Mail and all your personal data on a simple mobile device such as a USB key. Free Trial!

 4)   Migo® Portability Software 2.9
Migo allows you to create an encrypted backup of your Outlook, Outlook Express & Thunderbird email, files, desktop and other computer settings. With Migo you can be sure that your data will always be synchronized and current.

 5)   Sync2 for Outlook 2.20
Microsoft Outlook synchronization add-in. Sync Outlook between computers without a server. Synchronize Outlook data using shared folder on LAN, USB drive, FTP. Share Outlook Calendars with Google Calendar. Sync Google Contacts with Outlook Contacts.