Most documents I receive are in MS Office format. You can edit / comment them in the Docs 2 Go aop, but I don't find that input method very easy. Marking up on the e-ink side is better for me (although of course whoevere I send the marke up copy back to still then has to edit their original document). I have not been able to find a way to open anything exept pdf attachments into the e-ink reader, but did find this easy solution: email them to converter@pdf24.org and within seconds you receive an email back with attachments converted to pdf format. There are a few services like this out there, this one worked best for me. Think twice, of course, about sending confidential documents through these services.