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Developing an Alerts Web Service that Uses Outlook 2003 Alert is an interesting MSDN article that shows how third party applications can use Outlook alerts to notify users of specific events occurring.

A developer can easily incorporate Outlook alerts into an application through an alerts Web service that collaborates with Outlook. The user can then set up an alert in that application or in Outlook. For example, the user can set up an alert for a Windows SharePoint Services site from Windows SharePoint Services or from Outlook. The user can then manage his or her alerts (edit or delete alerts) in Outlook 2003.

The Web service maintains a database for user alert data. To collaborate with Outlook, the alerts Web service notifies Outlook when the user sets up an alert, the Web service sends appropriate SOAP messages to Outlook when the user views, edits, or deletes his alerts in Outlook.

The article describes how an alerts Web service can perform these tasks and then describes a sample alerts Web service, the RSS Alerts Web service which allows a user to be informed when news feeds are posted to the site.