Check http://www.microsoft.com/downloads/details.aspx?displaylang=en&familyid=ba611554-5943-444c-b53c-c0a450b7013c

>I have an application that will need to use MSSOAP.SoapClient30 in the near future, what is the easiest way to get soap installed on the clients computers? In an ideal world I would like my app to install it behind the scenes without any user intervention.