Patience is important, messages might not start vanishing for a few hours but quota is freed up. Hoping you have Exchange Online Plan 2 license so you really have the over 50 GB available. Set-Mailbox thebigbox@windrammer.net -ProhibitSendQuota 98GB -ProhibitSendReceiveQuota 99GB -IssueWarningQuota 97GB Clean up things? Again, it may take a few hours to see the …