Hi @deanwarrenuk ,
Microsoft is now only using the page below for product and services lifecycle support:
https://learn.microsoft.com/en-us/lifecycle/products/
I couldn't find MSXML 6.0 there, but only 4.0, but by looking at all the official Microsoft download links for MSXML 6.0 which are down, it appears that it would be no longer supported, however I cannot confirm this.
You could raise an issue over HERE and ask Microsoft directly.
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Best regards,
Leon