Microsoft Office 2007 for PC and 2008 for Mac introduced new file formats, called "Microsoft Open XML." These are the file formats with the "x" extensions, such as ".docx", ".xlsx", and ".pptx".
The new file formats offer the following benefits:
At this point the previous versions of Word and Excel (2003 and 2004) should all have been upgraded to be able to read the new file types, so there is no reason to continue to use the old file formats. If you're still saving to ".doc" and ".xls", here's what you can do to start saving to the Microsoft Open XML file formats.
Setting the Default "Save" File Format
Microsoft Office 2007
Open each Office 2007 application and perform the following steps on each application
Microsoft Office 2008 for Mac
Open each Office 2008 application and perform the following steps on each application.
The next time you click save in the Office applications for which you have changed the default file format it will save in the new file formats.
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