EXHIBIT 2.1 AMENDMENT NO. 1 DATED AS OF JUNE 18, 2000 TO THE AGREEMENT AND PLAN OF MERGER BETWEEN HEALTHEON/WEBMD CORPORATION AND MEDICAL MANAGER CORPORATION, DATED AS OF FEBRUARY 13, 2000 Amendment No. 1, dated as of June 18, 2000 (the "Amendment"),...Agreement and Plan of Merger • July 24th, 2000 • Healtheon Webmd Corp • Services-prepackaged software • Delaware
