Open Document Formats: A Successful Transition?

Some Background Years ago I wrote about my interest in switching away from proprietary binary blob formats (primarily things like Microsoft .doc, .xls & .ppt formats) and instead move to their more open alternatives (OpenDocument .odt, .ods & .odp and Office Open XML .docx, .xlsx & .pptx). The genesis for this drive was an article by Vincent Cerf where he was talking about the problems around reading these proprietary formats in the future, when the original vendors are either out of business or no longer interested in supporting them.