If you sign up for a free skydrive account, the skydrive has online web apps for each MS Office app. They are slimmed down though pretty extensively in that a lot of the fonts are not present and some formatting things such as superscript and subscripting. But for basic processing and the need to make powerpoints, excel sheets, and word documents it is an option. This is one of the reasons I like skydrive over the other cloud services out there, it make group projects much easier. Some will say use google drive because of google docs but I use my google drive to store my electronic textbooks. Some of these medical books can be close to .5GB large. I myself had gotten a free copy of full professional or whatever it is that contains every app of MS office 2013 as well as 2010 through school so I dont really have much worries there.
