#8. Disable litigation hold and single Item recovery

During migrations, if you need to repair the migrated data and overwrite many items, we recommend that you disable both litigation hold and single item recovery on related destination mailboxes. If litigation hold or single item recovery is enabled, when items are deleted or overwritten, Exchange will automatically move those items to the Recoverable Items folder and take up storage there.

Litigation hold is not enabled by default while single item recovery is.

Refer to and for details.

Sample PowerShell Command:

Set-Mailbox -Identity user@contoso.com -SingleItemRecoveryEnabled $false -LitigationHoldEnabled $false