i have to plug "the botnet" on this one.
google docs, google sheets, and google slides provide as web based alternative for viewing and creating these document formats using only a web browser.

i use loonix at work, and often have to deal w/ excel docs sent by clients. google sheets works superbly for my use case. i don't do a lot of formulas, so i cant really comment on how much of that functionality exists. sheets lets you export in a variety of formats including powerpoint. just saying, using google docs has worked for me in the past, no vm required.