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https://www.vspbreda.nl/nl/exchange/error-message-when-you-try-to-remove-exchange-server-from-a-mailbox-server-that-no-longer-hosts-mailboxes-qone-or-more-users-currently-use-a-mailbox-store-on-this-serverq/
Error message when you try to remove Exchange Server from a mailbox server that no longer hosts mailboxes: "One or more users currently use a mailbox store on this server"