Am Dienstag, 11. Dezember 2012 12:40:21 schrieb theo.schmidt@wilhelmtux.ch:
My own experience is now that I can mostly open DOCX, XLSX and PPTX files in Libre Office, but there are often things missing, e.g. lines of text, columns of data, or complex XLSX documents take ages to load. Is this the "fault" of OOXML, MS-Office, Libre Office or all three?
At first it is Microsoft's "fault", as they have choosen a dataformat that is hard to implement from technical and legal aspects. There is reason to believe that they did this delibertately as it is the usual game.
I secondly believe that users (paying or non-paying) customers, especially organisations, are responsible for using the format and thus giving it some real world weight.
If you accept both as given, you could try to come up with enough helping hand or funding for someone to do a good Free Software implementation.