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check out the frx.exe tool in the \FSLogix\Apps folder. It can do that, and copy data to the new container.

I used to do that by using O365 containers as well as Profile Containers and messing with the Outlook data file path via the Registry - didn't know frx.exe could do that, is that new? I remember FSLogix support at the time didn't mention it

I don't think it's new. I saw a comment from @Webster Webster regarding this a while back. Just not documented well?

You'd have thought the support person I was talking to might have mentioned it at the time, given that it was probably their best one - not to worry, I know about it now 🙂