1 EXHIBIT 21.1 Critical Path, Inc. Subsidiaries Domestic: dotOne Acquisition Corp. FaxNet Netmosphere, Inc. RemarQ Communities, Inc. Peer Logic India International: 3034996 Nova Scotia Company, A Nova Scotia Company 3034997 Nova Scotia Company, A Nova Scotia Company Amplitude Software UK Ltd. Compass Acquisition Corp. Compass Holding Corp. CP AG (Switzerland) CP A/S (Denmark) CP B.V. CP Data Centre UK CP Germany CP Ireland CP Latin America CP SA (aka FaxNet SA) CP SA (France) CP SpA (Italy) Critical Path Data Center Critical Path GmbH Critical Path Messaging Co. Critical Path SA (aka FaxNet SA) Critical Path Technologies (formerly PL UK) Critical Path UK Ltd. FaxNet Argentina FaxNet Services Corp. Fisher Technology Group Inc. Licoln Software Ltd. Lookforth Ltd. Nihon PeerLogic KK Peer Logic Canada, Inc. RemarQ UK Ltd. UI Telecom, Inc. Unicom Int'l. LLC