EXHIBIT 4.2 AGREEMENT, WAIVER AND ESTOPPEL AGREEMENT, WAIVER AND ESTOPPEL, dated this 6TH day of March, 2001 by and between the signatories hereto designated as "Series B Convertible Preferred Stockholders" and the "Series C Convertible Preferred...Agreement, Waiver and Estoppel • May 21st, 2001 • United Shipping & Technology Inc • Air courier services • New York
