[JonAtkinson]

Your original comment was speaking in general terms, about all Sharepoint services. Not your specific deployment. Details matter or your argument falls down.

As for concurrency, read my comment again, I use the specific word.

[brnt]

If you see that I talk about a certain config of Sharepoint, it's much faster to point that out than being argumentative.

What did you do to have concurrent editing (or what did you not do), and how does it integrate the various diffs?