Revome ADSAccount and Exchange-Definition from Person object without deleting them

Hi guys,

how can i remove ADSAccount- and Exchange-Definition from Person object without deleting them? 

The mailbox and user accounts are in use, but were accidently assigned via account definition to a person object.

Now i have to spilt person object from those definitions. When i remove account definitions from the tasks - pane, the ressources will be deleted in the targt systems.

EDIT: We are using Version 8.1

Please help me!

BR from germany

Daniel

EDIT2: 

Hi everyone,

does no one have an idea how to solve this task?