For our school work, Microsoft Office is very much used. Students exchange MS Office files with one another for homework and projects. Based on my observation, each time a file in MS Office 2007 format (.docx, .pptx, or .xlsx) is sent to a student who uses MS Office 2003, that receiving student complains, and either makes the sender save it as a 2003 file and resend it, or sulk face in one corner of the room for not knowing how to open the 2007 file.
Let’s make a list here of few ways to open .docx, .pptx, and .xlsx files in a computer without Microsoft Office 2007. 
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