wouldn't I need a web-service running on the WinNT box, waiting to hear the remote SOAP call from the Solaris box?

Yes, you will need an ASP/VB SOAP server, here is the example from the SoapLite website:

<%
    Response.ContentType = "text/xml"
    Response.Write(Server.CreateObject("SOAP.Lite") _
      .server("SOAP::Server") _ 
      .dispatch_to("/Your/Path/To/Deployed/Modules") _
      .handle(Request.BinaryRead(Request.TotalBytes)) _
    )
%>
[download]

Where your module would take your data and put it into Access.

--
hiseldl
"Act better than you feel"