There's nothing more confusing or annoying than having duplicate e-mails or contacts in your inbox. Outlook Express Duplicate Killer is a powerful "search and destroy" application which uses algorithms to locate duplicates in seconds. You can choose between an easy one-click duplicate removing-merging process or a sophisticated wizard. If you perform the task regularly, you can even save your search settings and then access it from the Outlook Express Toolbar.

Obviously, this program only works on Outlook Express which is shame because a tool like this for Outlook would be a real bonus for many office workers. The trial version is fully functional although it will only search and find duplicates, and remove 10 files at a time. It's also limited to 14 days of use.

If you're plagued by contact and duplicate mail confusion in Outlook Express then look no further.