Preheat oven to 325 degrees. Remove packaging; reserve liquid. Place ham cut-side down on large sheet of foil in roasting pan, pour reserved liquid over ham and wrap completely with foil.
Warm ham in oven for 10-12 minutes per pound. Do not overheat. After removing ham from oven, let ham sit for 5 minutes before glazing.
Heat glaze packet for 15 seconds in microwave. Glaze is hot, so be careful when opening packet. Holding packet with a towel or oven mitt, cut corner off packet and pour glaze into a bowl. Stir well and spoon over ham.
Let glazed ham sit for 5 minutes before serving to allow glaze to melt over ham.