How do I move autocomplete data to a different/new mailbox?

In order to fix an issue with a grayed out delete button for a few users; I have to export their mail, disable their mailbox, create a new one, and reimport their mail.

But since the auto complete data is saved under the mailbox.  How do I go about saving that and importing it?

I've done this:

http://benosullivan.co.uk/windows/how-to-copy-auto-complete-in-outlook-2010/

But it did nothing.  I do have the entire roaming cache folder saved though.