In my honest opinion, write support for OOXML is a mistake. LibreOffice should not help spreading a file format which has been bribed through the standardization boards for 2 reasons: fight the ODF standard and establish a non-free XML format for MS applications only. Microsoft's "Office Open XML" restores a certain level of incompatibility while having something with "open" and "office" and "XML" in the name anyway. What MS 2007 produces by default is the "extended version" of OOXML. It represents Microsoft's conception of an office document beyond any standard. With Office 2010 they started supporting the "official" OOXML version which they bribed through the boards but even that one is an incredibly complicated mess, impossible to implement by anybody except Microsoft. MS Office 2007 introduced a lot of new features tailored to the new file formats, and of course the new file formats can represent these new features where the old binary formats must fail to do so. So the new file format may store things that can not be exposed by any software other than resent MS Office versions whereas the old binary format supports almost the same feature set as ODF (after 20 years of co-evolution). As long as MS Office comes with the same binary file filters as in Office XP, there is no technical reason to exchange OOXML documents between LibreOffice and MS software. -- View this message in context: http://nabble.documentfoundation.org/Compatibility-problems-between-LO-Calc-and-EXCEL-2007-and-2010-XLSX-tp3277603p3278315.html Sent from the Users mailing list archive at Nabble.com. -- For unsubscribe instructions e-mail to: users+help@global.libreoffice.org Problems? http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/ Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette List archive: http://listarchives.libreoffice.org/global/users/ All messages sent to this list will be publicly archived and cannot be deleted