MC383875: Microsoft Defender for Office 365: Quarantined message storage in hidden system folder on user mailbox
Updated June 7, 2022: We have updated the content below for clarity. Thank you for your feedback. Updated May 24, 2022: We have updated this message to show as intended. Thank you for your feedback. Microsoft Defender for Office 365 is making some changes to quarantine folder storage. The experience for users will remain the …