How can I determine if user mailboxes contain custom folders?

How can I determine if user mailboxes contain custom folders?

Outlook can creates two top-level folders representing all public folders and all mailbox folders. Mailbox folders contain all Outlook built-in and custom folders.  In Outlook, an item is the object that holds information. Items include mail messages, appointments, contacts, tasks, journal entries, and notes. The Name Space object has at least two top-level folders representing all public folders and the user's mailbox. The preceding procedure uses the GetMailboxName procedure to return the name of the mailbox folder.

To work with a single item or subset of items in a folder, you use the Restrict method, which returns a collection of objects that match the criteria specified in the method's single argument.  The Northwind Contacts.dot sample file is a Microsoft® Word template that retrieves contacts, those displays contacts folder in the user form for  the Outlook Contacts folder. The contact name and address information is inserted in an address block in a letter when a user select a contact from the form.