0001012870-99-001608 424A 1 19990517 CRITICAL PATH INC 0001060801 7389 911788300 CA 424A 33 333-78197 99625910 320 FIRST STREET SAN FRANCISCO CA 94105 6502334512 320 FIRST STREET SAN FRNACISCO CA 94105 424A 1 000101287099001608-001-seq1-424a.txt PRELIMINARY PROSPECTUS DATED 05/11/1999