EXHIBIT 16.1 [LETTERHEAD OF ARTHUR ANDERSEN] May 12, 1998 Securities and Exchange Commission 450 Fifth Street Washington, D.C. 20549 Dear Ladies and Gentlemen: We have read the section entitled "Change in Accountants" included in the attached Form S-1 dated May 14, 1998 of PointCast Incorporated to be filed with the Securities and Exchange Commission and are in agreement with the statements contained therein. Very truly yours, /s/ Arthur Andersen LLP ARTHUR ANDERSEN LLP San Jose, California