According to an article a friend sent me, the old .doc .xls .ppt formats are being thrown out the window for new MS Open XML formats. Maybe this is old news but it is new to me.
Article
Article
Take a long look at the DOC, XLS, and PPT files that have graced your data directories. They?re about to be replaced by Microsoft?s Open XML file format?a change that could have seismic implications for IT managers sitting on top of more than a decade?s worth of legacy Office documents.
