TextBox.IntegralHeight Property (Outlook Forms Script)
Returns or sets a Boolean that specifies whether a TextBox displays full lines of text or partial lines. Read/write.
expression A variable that represents a TextBox object.
True indicates that the text box resizes itself to display only complete items (default). False indicates that the text box does not resize itself even if the item is too tall to display completely.
The IntegralHeight property relates to the height of the text box, just as the AutoSize property relates to the width of the text box.
If IntegralHeight is True, the text box automatically resizes when necessary to show full rows. If False, the text box remains a fixed size; if items are taller than the available space in the text box, the entire item is not shown.