I am trying to automate the process of creating an Exchange Mailbox for AD users and am running into an issue. When calling the CreateMailbox method I am receiving the error "Error HRESULT E_FAIL has been returned from a call to a COM component". I have installed and referenced the Exchange Management Tools and am using impersonation for permissions.

Here is the code:

            ActiveDs.IADsUser adUser = (ActiveDs.IADsUser)user.NativeObject;
            adUser.AccountDisabled = !Active;
            user.CommitChanges();

            //Set Password
            user.Invoke("SetPassword", Password);
            user.CommitChanges();            

            //Create Mailbox
            IMailboxStore mailbox;
            mailbox = (IMailboxStore)adUser;
            mailbox.CreateMailbox("LDAP://CN=StandardUsers,CN=StandardUsers,CN=InformationStore,CN=xxxxx," +
    			"CN=Servers,CN=First Administrative Group,CN=Administrative Groups," +
    			"CN=xxxxx Main,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=xxxxx,DC=com");             
            user.CommitChanges();