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

Originally posted by Microsoft May 19, 2022 Exchange Online 0 Comments

Microsoft Defender for Office 365 is changing the way quarantined messages are stored for users. Previously, quarantined messages were stored in a hosted repository away from the User mailbox. Moving forward these messages will be stored in a hidden system folder that is in the user mailbox. Although this hidden system folder is in the user mailbox it is important to note that this folder is not accessible by the users in any way. It is also worth noting that this change aligns with our long-term goal of surfacing the quarantine experience for users in the outlook client. For users who do not have a cloud mailbox (i.e., On-prem users) we will continue storing their quarantined messages in a hosted repository.
More info: https://techcommunity.microsoft.com/t5/microsoft-defender-for-office/simplifying-the-quarantine-experience-part-two/ba-p/3354687

Product	Exchange
Release phase	General Availability
Release date	July CY2022
Platform	Web
Cloud Instance	DoD, GCC, Worldwide (Standard Multi-Tenant), GCC High
Created	2022-05-19
Roadmap ID	93302
Roadmap Link	https://www.microsoft.com/microsoft-365/roadmap?featureid=93302