Microsoft has recently introduced a free Word 2007 viewer that lets you view docx Word documents, even if you don't have any version of Word installed. This does away with the need to download the Office 12 Compatibility Pack or manually convert .docx to .doc format using any of the online conversion services to open a Word 2007 document. To use the viewer you will still need to install the Office Compatibility Pack.
Microsoft has also provided a Powerpoint 2007 viewer for pptx presentations. There is currently no Excel 2007 viewer however you can convert xlsx to xls using Zamzar and then view the converted spreadsheet in Google Docs.
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