Indeed it works fine, but one of the key points is the order:
1) you go to the mail control panel, then "data files" (or via profiles,
"data files")
2) you click "open folder" and move the data files to their target
destination.
If you delete or move the files before being in the control panel "data
files" tab, the system will recreate empty data files !!!
3) back in the control panel, you select the data files and click
"settings". Go passed the error message and find the data file(s) in their
new location.

hth
Philippe