First impressions: You can use firefox. Worked on 2007 but not 2003. I assume this means it requires Office 2007 or better. Requires an additional download (

First impressions: You can use firefox. Worked on 2007 but not 2003. I assume this means it requires Office 2007 or better. Requires an additional download (update to Office, which I believe also authenticates your copy) to create or edit files. (Can view files without) No OneNote Live (yet?) Overall, I must say it is pretty janky.