[michaelaye]

Both manuals might write the same, but in my experience I just have many more issues with an mpp import via Merlin than with OP.
If only the OP team would repair the bug with importing MPP milestones as 0-day tasks with locked dates, the mpp import would even be bug free for me ,at least for the mpp files that are currently available to me.

Your Billings export sounds like a good idea, but as so often, I have the feeling that this good idea might actually be a dungeon of effort.
I would prefer OP for the iPad first, please! ;)