Delete the mailbox user first.
Uninstalling the Database
To ADSI, under configuration partitions, expand Cn-services,cn=microsoft exchange,cn=first organization,cn=administrative Groups,cn=exchange Administrative,cn=databases
Delete a mail database
And then to the control Panel to uninstall.
Previous normal uninstallation encountered this error:
Error:
Unable to continue uninstallation. Databases Mailbox Database XXXXX: This mailbox database contains one or more mailboxes, mailbox plans, archive mailboxes, or arbitration mailboxes. To get a list of all mailboxes in this database, run the get-mailbox-database <database id> command. To get a list of all mailbox plans in this database, run the Get-mailboxplan command. To get a list of all the archive mailboxes in this database, run the get-mailbox-database <database id>-archive command. To get a list of all the quorum mailboxes in this database, run the get-mailbox-database <database id>-arbitration command. To disable a non-quorum mailbox so that you can delete a mailbox database, run the Disable-mailbox <mailbox id> command. To disable archiving of messages so that you can delete a mailbox database, run the Disable-mailbox <mailbox id>-archive command. You should move the quorum mailbox to a different server; To do this, run the new-moverequest <parameters> command. If this is the last server in your organization, run the Disable-mailbox <mailbox id>-arbitration-disablelastarbitrationmailboxallowed command to disable the quorum mailbox. You should move the mailbox plan to a different server, and to do so, run the Set-mailboxplan <mailboxplan id>-database <database id> command. It is running command ' remove-mailboxdatabase ' cn=mailbox Database xxxxxx,cn=databases,cn=exchange administrative Group (XXXXXX), CN =administrative groups,cn=xxxxxxx,cn=microsoft exchange,cn=services,cn=configuration,dc=xxxxx,dc=xxxxx '-whatif '.
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Uninstalling Exchange normally