Public Folders Exposed as Web Folders
Exchange automatically creates a URL for each item in the information store. This means users can access public folders, messages, and attachments from any Web client.
When a folder, a message, or an attachment is created in the database, a relative URL is dynamically generated. URLs for resources in existing Exchange databases are created when Microsoft Web Web Storage System is upgraded.
Note URL paths to items in the information store are not case-sensitive; for example, if a message in a folder is entitled MyCompany Announcement, the URL is http://myserver/user_name/inbox/mycompany announcement.