Error While Removing Mailbox Databases

Question

I'm trying to remove two extra Mailbox databases that we recently migrated users off of during consolidation. However, when I try and remove the DB's I get the following error message:
Microsoft Exchange Error
The mailbox database 'chsexmbm' cannot be deleted.
chsexmbm
Failed
Error:
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 command Get-Mailbox -Database <Database ID>. To get a list of all mailbox plans
in this database, run the command Get-MailboxPlan. To get a list of archive mailboxes in this database, run the command Get-Mailbox -Database <Database ID> -Archive. To get a list of all arbitration mailboxes in this database, run the command Get-Mailbox
-Database <Database ID> -Arbitration. To disable a non-arbitration mailbox so that you can delete the mailbox database, run the command Disable-Mailbox <Mailbox ID>. To disable an archive mailbox so you can delete the mailbox database, run the
command Disable-Mailbox <Mailbox ID> -Archive. Arbitration mailboxes should be moved to another server; to do this, run the command New-MoveRequest <parameters>. If this is the last server in the organization, run the command Disable-Mailbox <Mailbox
ID> -Arbitration -DisableLastArbitrationMailboxAllowed to disable the arbitration mailbox. Mailbox plans should be moved to another server; to do this, run the command Set-MailboxPlan <MailboxPlan ID> -Database <Database ID>.
OK
Now I have run the "Get-Mailbox -Database <DB> -Arbitration" and get three entries:
Name                                    Alias                                  
ServerName
FederatedEmail.4c1f4d8b-8179-4148-93bf- FederatedEmail.4c1f4d8b-8179-4148-93bf- smschsexmb1
00a95fa1e042                            00a95fa1e042
SystemMailbox{1f05a927-f1d5-4153-bd93-d SystemMailbox{1f05a927-f1d5-4153-bd93-d smschsexmb1
fca46ac6957}                            fca46ac6957}
SystemMailbox{e0dc1c29-89c3-4034-b678-e SystemMailbox{e0dc1c29-89c3-4034-b678-e smschsexmb1
6c29d823ed9}                            6c29d823ed9}
However, when I try and move or remove these mailboxes, I get an error from EMS stating that they cannot be found.
Any idea what I need to do here to resolve this so I can remove these DB's?
Thanks!!

Answer 1

Hi
Suggestion 1:  verify mailboxes:
1. In Exchange management shell, run these cmdlets:
Set-ADServerSettings -ViewEntireForest  $True
get-mailbox -database "DBname" –arbitration
2. Please verify if arbitration mailbox shows. If yes, please move these mailboxes with this cmdlet:
Get-Mailbox -Database "DBname" -Arbitration|New-MoveRequest -TargetDatabase "DB2Name"
Note: please replace DB2Name with the target database name.
3. Wait for the complete of AD replication, after that, please try to remove database again.
Suggestion 2: If the database still cannot be removed and you have followed the instruction in error message, but nothing returned. It seems the database is empty. So I suggest we use ADSI Edit to remove the database object directly since it no
longer contains any mailboxes.
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