I was helping out one of my friend to send a huge word file over the Internet. Like most of the people around, I took the word file and zipped it. Guess what, to my surprise, there wasn’t even a 10% reduction in the file size (usually it gets reduced by 40%).
This made me curious and i did a little search over the topic today. Its because Office 2007 files are pre-zipped, thats the reason why we get the extension .docx , .pptx etc.. You can even open them using Winzip by simply renaming their extensions to .zip. So why zip a file thats already zipped. Rar it! 
Ref : http://office.microsoft.com/en-us/help/HA100069351033.aspx
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