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Written by Brad

May 26, 2022

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Microsoft Defender for Office 365: Quarantine asynchronous update

Exchange Online, Microsoft 365 Experts, SharePoint Development Services

From Microsoft Corporation
Technical Bulletin MC384326 · Published May 25, 2022

Message Summary

Microsoft Defender for Office 365 is introducing a new way of interacting with quarantined messages through an asynchronous approach. Previously, quarantine operations were carried out in a synchronous model on the technical execution side.

Note: This change is a major step towards introducing partial string search functionality and 1,000 message bulk operation support in quarantine.

This message is associated with Microsoft 365 Roadmap ID 93303.

When this will happen

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

Government: will begin rolling out in late July and be completed by early August.

How this will affect your organization:

Previously, an Admin from could release a quarantine message to a User in However, to eliminate the risk that comes with such behavior we will be disabling it. Moving forward an Admin will need to download the item from quarantined with the password protected feature and use the download item for the specific workflow they want to accomplish. Please note that we will continue to support an Admin release to recipients who are in the same organization as the Admin.

Release to recipient in external organization disabled:

Release to recipient in external organization
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Share email screens:

Share email
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New quarantine status:

We will be introducing two new quarantine statuses namely “Preparing to release” and “Error.” The “Preparing to release” status will indicate that the messages are in the process of being released while the “Error” status will indicate that a message release has failed, and the user needs to retry.

New quarantine status
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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.



QuixTec provides this and other technical bulletins unaltered from Microsoft. As an authorized Microsoft Partner, we ensure that all our solutions we deliver to you include the latest Microsoft updates.

ABOUT US: QuixTec, LLC is a U.S. certified Veteran Owned, modern DevOps organization with experience in a plethora of IT Software Languages.  As a Microsoft Partner, we specialize in Microsoft SharePoint, Microsoft365 & HTML5 technologies for small to enterprise-sized organizations. The founder, Richard, has 30 years of experience working with several notable companies that include World Vision, Expedia, Microsoft, Levi Strauss, NASA, Boeing Aerospace, Los Alamos National Laboratory, and the U.S. Air Force, to name a few.  QuixTec is in the Seattle area. Phone today for a free consultation and project estimate.

(425) 367-9025


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