Exhibit 4.23 COVENANT NOT TO SUE This Covenant Not To Sue (the "Covenant Not To Sue") by and between I-Link, Inc. ("I-Link"), its officers, directors, agents, employees, subsidiaries, parent entities, affiliates, and each of their respective officers,...Covenant Not to Sue • March 21st, 2001 • Winter Harbor LLC • Telegraph & other message communications • New York
1 EXHIBIT 4.7 COVENANT NOT TO SUE This Covenant Not to Sue ("Agreement") is made and entered into as of February ____, 1998 by and between General Magic, Inc., a Delaware corporation (the "Company"), and Microsoft Corporation, a Washington corporation...Covenant Not to Sue • June 5th, 1998 • General Magic Inc • Services-prepackaged software • Delaware
1 EXHIBIT 10.7 COVENANT NOT TO SUE In consideration of one dollar ($1.00), and other good and valuable consideration, the sufficiency and receipt of which is acknowledged, CTRC Research Foundation ("CTRC"), on the one hand, and Ilex Oncology, Inc....Covenant Not to Sue • December 12th, 1996 • Ilex Oncology Inc