ComboBox.ListIndex Property (Outlook Forms Script)
Returns or sets a Variant that represents the currently selected item in a ComboBox. Read/write.
expression A variable that represents a ComboBox object.
The ListIndex property contains an index of the selected row in a list. Values of ListIndex range from -1 to one less than the total number of rows in a list (that is, ** ListCount** - 1). When no rows are selected, ListIndex returns -1. When the user selects a row in a ListBox or ComboBox, the system sets the ListIndex value. The ListIndex value of the first row in a list is 0, the value of the second row is 1, and so on.
The ListIndex value is also available by setting the BoundColumn property to 0 for a combo box. If BoundColumn is 0, the underlying data source to which the combo box is bound contains the same list index value as ListIndex.