Hey, great news. Microsoft Office can now be purchased from your computer from the Windows Store! Yay!
Otherwise, retailers carry physical copies still in stores. But why not be ecologically friendly, and purchase through Microsoft itself, so that if you ever lose your piece of paper or disk, you haven’t lost everything.
If you don’t feel like purchasing Microsoft, there are programs like OpenOffice that have similar functionality. But sometimes Microsoft programs interact with each other in ways beneficial to businesses.