EXHIBIT 15.1 August 13, 2002 Securities and Exchange Commission 450 Fifth Street, N.W. Washington, D.C. 20549 Commissioners: We are aware that our report dated August 7, 2002 on our review of interim financial information of Critical Path, Inc. (the "Company") as of and for the period ended June 30, 2002 and included in the Company's quarterly report on Form 10-Q for the quarter then ended is incorporated by reference its Registration Statements on Form S-8 (Nos. 333-63080, 333-51504, 333-44418, 333-40476, 333-36228, 333-95933, 333-95279, 333-87553) and on Form S-3 (Nos. 333-39958, 333-38006, 333-38000, 333-36382). Very truly yours, /s/ PricewaterhouseCoopers LLP