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Of course the whole linux thing is not applicable to every established company structure.
First off, I did talk about users, when I said "What about the massive costs of retraining your entire staff on how to use their computers"
Is your staff not your users? They are the ones who have to use the computers to do their work. Sorry if that was not clear, but it seems clear to me.
One thing that struggles me is that archivists over the world who used to use MS Office or other closed products (or still do) have severe problems conserving data over the longer term, for several reasons, including licensing issues, software no longer being available, data not importable into current versions, etc.
And when I think about how many companies archive their business data and fall into the trap of using proprietary formats, ...
And OOXML won't come to the rescue here, as it is impossible to implement for most software vendors, proprietary or not.