ComboBox.ColumnCount Property (Outlook Forms Script)
Returns or sets a Long that represents the number of columns to display in a combo box. Read/write.
expression A variable that represents a ComboBox object.
Setting ColumnCount to 0 displays zero columns, and setting it to -1 displays all the available columns. For an unbound data source, there is a 10-column limit (0 to 9).
You can use the ColumnWidths property to set the width of the columns displayed in the control.
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