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Exchange 2010 remove disconnected mailbox error - doesn't exist on database "mailbox"

ajdratch
ajdratch asked
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Last Modified: 2020-01-19
I moved a client from Exchange 2010 to Office 365. Now that the migration is done, I want to remove Exchange.  All the mailboxes are disconnected however I can't remove them. I ran the commands:
 
$mailboxes = Get-ExchangeServer | Where-Object {$_.IsMailboxServer –eq $true} | ForEach-Object { Get-MailboxStatistics –Server $_.Name | Where-Object {$_.DisconnectDate –notlike ‘’}} | select displayname, mailboxguid, database

$mailboxes | ForEach { Remove-Mailbox -Database $_.Database -StoreMailboxIdentity $_.MailboxGuid -confirm:$false }

I then get this message for every disconnected mailbox

Mailbox "31ea850d-6a5d-4286-9441-d5baf6c7c4ef" doesn't exist on database "Mailbox".
    + CategoryInfo          : NotSpecified: (0:Int32) [Remove-Mailbox], ManagementObjectNotFoundException
    + FullyQualifiedErrorId : DFBA03DE,Microsoft.Exchange.Management.RecipientTasks.RemoveMailbox


I stopped the sync this morning by running Set-MsolDirSyncEnabled -EnableDirSync $false.

How can I remove these disconnected mailboxes
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