A little essoteric, but I recently needed to post some merge fields on a Word application form to a server to save on rekeying when the application form is completed.
Thankfully, VBA in Word can utilise any of the built-in Windows libraries and therefore the above can be easily accomplished using the MSXML2 library.
Some sample code for posting data to a HTTP server in VBA:
Private Sub PostData()
Set http = CreateObject("MSXML2.ServerXMLHTTP")
http.Open "POST", "http://mycompany.com/url/path", False
http.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"