" MS added AJAX as a proprietary feature to make the experience of using Outlook in Explorer richer than in Mozilla." No, they wanted Outllok Web to be closer

" MS added AJAX as a proprietary feature to make the experience of using Outlook in Explorer richer than in Mozilla." No, they wanted Outllok Web to be closer in usability to Outlook Desktop. They had a problem and they solved it. This is how the web standards body works anyway : somebody does something good/inovative (see ajax, jquery etc etc) and after a while it gets standardized.