If I upgrade to OO5 will my colleague running OO4 still be able to read / write to the same files?
My primary use for OO is to keep meeting notes in the app on my mac which I share with others via a synchronized Box.com folder. We don’t use the iOS app.
You have the option to convert the files to a new format. Don’t do that if you want backwards compatibility.
You can also export to the OO4 format if you make new files in v5 you want to send them.