Skip to Content

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 same and users can leverage the delete action to maintain the storage folder for their quarantined messages. This message is associated with Microsoft 365 Roadmap ID 93302.

MC383875: Microsoft Defender for Office 365: Quarantined message storage in hidden system folder on user mailbox

When this will happen

  • Standard: will begin rolling out in mid-June and be completed by late June.
  • Government: will begin rolling out in early July and be completed by late July.

How this will affect your organization

Non delivery report (NDR):

In the case that a user’s quarantine storage is full, new incoming messages routed to quarantine will be rejected and an NDR will be generated for those messages.

In the case of Zero hour Auto Purge, where malicious items need to be zapped from inbox to quarantine but there is no space, these messages will be instead, added to the junk mail folder.

Note: When there is a False positive Zero hour Auto Purge, messages wrongly moved to the Junk mail folder can be added back to their original location.

New hard delete experience:

Previously, when messages were deleted by users from quarantine, those deleted messages could still be retrievable within a 30-day period after deletion was made. To help users better manage their storage, we will be introducing a hard delete experience whereby once the messages are hard deleted, they can’t be recovered.

To help users better manage their storage, we will be introducing a hard delete experience whereby once the messages are hard deleted, they can’t be recovered.

Note: End users will only be able to delete quarantine messages that their Administrators has given them access to through the quarantine policy.

What you need to do to prepare

The goal for this communication is mostly for informational awareness. You may consider updating your training and documentation as appropriate.

Learn more

Message ID: MC383875
Published: 23 May 2022
Updated: 07 June 2022

Ads Blocker Image Powered by Code Help Pro

Ads Blocker Detected!!!

We have detected that you are using extensions to block ads. We need money to operate the site, and almost all of it comes from online advertising. Please support us by disabling these ads blocker.

Please disable ad blocker