How to down grade(remove) exchange server presence with other exchange server

How to down grade(Remove) exchange server presence with other exchange server.
Muhammad AliAsked:
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Miguel Angel Perez MuñozCommented:
Uninstalling Exchange removes from Administrative group. Prior uninstall you must move all mailboxes and any other stuff (like public folders, change inbound/outgoing mailflow).
Muhammad AliAuthor Commented:
Can you explain how to remove from "Administrative group"? . The other part you answer i understood.
Miguel Angel Perez MuñozCommented:
Administrative group are name used on Exchange orgs. All Exchange servers on your domain are inside one. Having different Exchange versions causes have more than one Administrative group.
To remove Exchange from those administrative groups (and other information contained on your AD), simply must to uninstall Exchange from your server:

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