Hello Sinead,
Microsoft Windows Vista and Microsoft Office are different products. Meaning when you buy one, you don't automaticly get the other. You can buy Microsoft Office at http://windowsmarketplace.com or from a reputable software retailer of your choice.
As to why it appears that everyone else owns Microsoft Office, I believe, because it is nearly the world standard in productivity software.
Thank you for your question,
Darin Smith
WGA Forum Manager