1 EXHIBIT 99.6 IRREVOCABLE STOCKHOLDER VOTING AGREEMENT THIS IRREVOCABLE STOCKHOLDER VOTING AGREEMENT (this "Agreement") is made as of the 12th day of April, 2001, by and among Vista Information Solutions, Inc., a Delaware corporation ("Vista"), the...Irrevocable Stockholder Voting Agreement • August 16th, 2001 • Fidelity National Financial Inc /De/ • Title insurance • Delaware
