With this free converter we passionately want to get you up and reading the new documents you are receiving. We do not, however, want to see you inadvertently mess up any critical documents you are working with. For that reason, only one-way read only conversion is supported in this beta. When sending documents back to colleagues and contacts, we recommend saving to the default .doc format from Mac Word listed as "Word document" in the save dialog. Similarly, we continue to recommend that you advise friends and colleagues who use Office 2007 and collaborate regularly with Mac users to save their documents as a "Word/Excel/PowerPoint 97-2003 Document" .doc, .xls, .ppt to ensure that the files can be robustly shared across platforms while waiting for final availability of Office 2008 for Mac.