All of the Microsoft Office 2007 and Microsoft Office 2008 for Mac programs use new default file formats based on the Extensible Markup Language (XML). XML is an open standard, and the change makes it easier to move files between different applications. It also makes file sizes smaller than those saved in the old binary formats.

• Word: .docx
• Excel: .xlsx
• Powerpoint: .pptx
• Access: .accdb

Prior to sending a document to a user of an earlier version of Office, you will need to check for compatibility. For more information, click here.