Moving data left by "old" users.

Hello
I wonder if you can suggest a solution. We have substantial amounts of data owned by users who have now left our institute. so the passwords are no longer available. Mostly this is in read-annotate groups.
Is there any way this can be handled at the group-owner level?
Looking at http://help.openmicroscopy.org/group-owner.html#move suggested that removing the user from the group would thwn allow the group-owner to move the data to another group but this didn't seem to be possible (at least via insight)
I note that this has probably been addressed in 5.4 but we are currently running 5.3.
Best Wishes
Ian
I wonder if you can suggest a solution. We have substantial amounts of data owned by users who have now left our institute. so the passwords are no longer available. Mostly this is in read-annotate groups.
Is there any way this can be handled at the group-owner level?
Looking at http://help.openmicroscopy.org/group-owner.html#move suggested that removing the user from the group would thwn allow the group-owner to move the data to another group but this didn't seem to be possible (at least via insight)
I note that this has probably been addressed in 5.4 but we are currently running 5.3.
Best Wishes
Ian