Exhibit 99.6 EXCHANGE AGENT AGREEMENT ------------------------ The Bank of New York 101 Barclay Street, Floor 21 West New York, New York 10286 Attention: Corporate Trust Trustee Administration Ladies and Gentlemen: NorthPoint Communications Group,...Exchange Agent Agreement • April 28th, 2000 • Northpoint Communications Group Inc • Telephone communications (no radiotelephone) • New York
