For developers and all those who are somehow connected with the new office document formats, information on the prevalence of the Open XML format can be useful.
So, the minimum number of users who can view, edit and save office documents in the Open XMl format has reached 100 million . This is how many downloads of the compatibility pack have been recently noted (by the way - this is the number of conscious installations )
If we add to this the number of users of Office 2007, as well as corporate users who only need one download of the package to install the compatibility package on all machines, then it will be completely useless to deny that Open XML has firmly entered modern life.