0000950149-99-001869 SC 13D 1 19991101 ISOCOR 0000879283 7372 954310259 CA 1231 SC 13D 34 005-49783 99738958 3420 OCEAN PARK BLVD SANTA MONICA CA 90405 3420 OCEAN PARK BLVD SUITE 2010 SANTA MONICA CA 904053306 CRITICAL PATH INC 0001060801 7389 911788300 CA 1231 SC 13D 320 FIRST STREET SAN FRANCISCO CA 94105 4158088800 320 FIRST STREET SAN FRNACISCO CA 94105 SC 13D 1 000095014999001869-001-seq1-sc-13d.txt SC 13D DATED OCTOBER 20, 1999