Symptoms

In Microsoft Exchange Server 2019 or Exchange Server 2016, if an error occurs in a move request or you cancel the move request before the move is complete, the mailbox can't be deleted from the destination database. After the retention period that you defined by using Set-MailboxDatabase cmdlet has already passed, you can still see it in Get-MailboxStatistics cmdlet's result. This issue may consume lots of disk space in Exchange Server. 

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Resolution

To fix this issue, install one of the following updates:For Exchange Server 2019, install the Cumulative Update 1 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.

For Exchange Server 2016, install the Cumulative Update 12 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.

References

Learn about the terminology that Microsoft uses to describe software updates.

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