According to a post on xml.com[0], development of the spec that would become XML-RPC started in 1998. Microsoft was selling (32-bit) NT for Alpha at that point,

According to a post on xml.com[0], development of the spec that would become XML-RPC started in 1998. Microsoft was selling (32-bit) NT for Alpha at that point, and according to Raymond Chen[1] they had an internal 64-bit build of it. I may be dating myself here, but a lot of folks new to the industry seem to think of anything pre-2000 as a dark time full of greyscale CRTs and dot-matrix printers. While those did exist in the home market, academic and business computing (where most of the advanced tech was being developed) was pretty advanced and a modern engineer would have felt right at home on a mid-90s UNIX workstation. If you go back further you'll start encountering things like CORBA, which were pretty bad, but had the legitimate excuse of being very early. Remember that the '90s moved fast by modern standards -- CORBA was contemporary with MS-DOS, while XML-RPC was after IE had dethroned Netscape. [0] https://www.xml.com/pub/a/ws/2001/04/04/soap.html https://www.xml.com/pub/a/ws/2001/04/04/soap.html [1] https://docs.microsoft.com/en-us/previous-versions/technet-magazine/cc718978(v=msdn.10) https://docs.microsoft.com/en-us/previous-versions/technet-m...