While I do not know of any multiple choice drop down list box in InfoPath,
you could make your own multi-select list box in InfoPath. Did you already
have a look at this?
http://blogs.msdn.com/infopath/archive/2004/04/01/106039.aspx
Regards,
S.Y.M. Wong-A-Ton
> Can something be selected or added to the properties or select settings from
> the properties box tabs to make a drop down list able to allow selection of
> one or more items? Like being able to select more than one country?