While visiting my favourite blogs, I discovered the very interesting article „What is “Custom XML?” … and the impact of the i4i judgment on Word“ from Gray Knowlton published on 23. December 2009. One day before, the U.S. Court of Appeals for the Federal Circuit upheld the trial court verdict rendered in favor of plaintiff i4i Limited Partnership and also upheld the permanent injunction issued against Microsoft barring future sales of Microsoft Word products containing the Custom XML features.
You can see the affected features of Word in question if you insert custom XML tags to your documents. They are made visible in the document by being highlighted in pink as shown in the screenshot above. The judgement will now have some impacts on these features in future versions of Word.