The Office XP Web Services Toolkit makes it possible to build applications that gather information and trigger transactions through various Web Services. The toolkit allows you to easily discover Web Services remotely. It also includes the Web Service Reference Tool, which lets you call a Web Service from inside an Office application.
More info:
hxxp://msdn.microsoft.com/msdnmag/issues/02/12/OfficeXPToolkit/default.aspx
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