[pizzapill]

Office 360. I dont use it myself but I heard its not comparable and does not work without Internet Explorer...

[ZenoArrow]

365, not 360. Also, the online features aren't the main selling point of Office 365, it's still predominantly a suite of desktop apps.

[Symbiote]

It works OK in Linux, I use either Firefox or Chromium.

I haven't needed to do anything complicated, but I can open a document that someone's used "Track Changes" on, and modify it etc.