Read Office 2007 documents without installing Office 2007
There are a bunch of services that will convert the new .xlsx, .docx, and .pptx files to old fashioned .xls, .doc, and .ppt files. But Microsoft has a solution for anyone who just needs to read documents without editing them.
This summer Microsoft release a compatibility update allowing Office 2003 and earlier customers to open the new file formats. It turns out that update also lets you use the free Word Viewer 2003 to read .docx files. Now Microsoft has also released PowerPoint Viewer 2007 with support for .pptx files.
There's no update to Excel Viewer 2003 yet, but we're guessing it's just a matter of time.