Bake ham according to package instructions, discarding the prepackaged glaze that comes with the ham. Plan to remove ham from oven 30 minutes before done.
In a small saucepan, mix pineapple, brown sugar, vinegar and prepared mustard and bring to a low boil.
Remove from burner and drizzle all over the ham, saving some for later. Return ham to oven and bake for the remaining 30 minutes.
When done remove slices from bone, place on platter and drizzle again with glaze. Serve remaining glaze on the side.