The activation process that i do (bad :D) duplicates the system folders.

The right one:
I delte the user from old BES.
Create in the new BES.
Wipe and reactivate the devices.

Al works fine.

To repair the duplicate folders, move the items for the "spanish" folder to the "english" folder, delete the "spanish" folders.
Close outlook and start it with: outlook /restfoldernames

regards.