On November 24, 1992, the Heal the World Foundation collaborated with AmeriCares to bring 43 tons of medication, blankets and winter clothes, totaling 2.1 million dollars, to war-torn Sarjajevo. The resources were allocated under the supervision of the United Nations. In December of the same year, Heal the World foundation assisted in airlifting additional relief supplies to the children of Bosnia, in association with Operation Christmas Child. The foundation transported 30,000 "shoebox gifts" of toys, school items, photographs, and inspirational letters collected by UK schoolchildren.
You can find a detailed list of most of Michael Jackson's charity work here http://www.megaupload.com/?d=3GSQVZOJ