But Google Docs can be somewhat limited when you need extra bells and whistles (more advanced formatting options), so we like to use Microsoft Word and PowerPoint when we need extra. In addition, I typically use Office for making my homeschool printables and some graphics and Google Docs is not robust enough for those uses.
At Microsoft's TechNetEvaluation Center, you can download a full working copy of Microsoft Office 2013 which is good for 30 days. Before the 30 day expiration, you can legally rearm your Office Copy using the Office Trial Extender. Each time you rearm Office, you get 30 additional days and you can rearm up to 5 times giving you 180 days total usage of Microsoft Office.