Overview of the Quarantined messages page in Microsoft 365 Lighthouse

Microsoft 365 Lighthouse lets you see insights and information about quarantined email messages across all your customer tenants. From a single view, you can triage quarantined email messages and take the appropriate actions. The data is available if the tenant has implemented Exchange Online Protection (EOP) and Microsoft Defender for Office365 Plan 1 (MDO).

You can access the information in Lighthouse by selecting Home in the left navigation pane, or by selecting Data protection in the left navigation pane to open the Quarantined messages page.


This page provides the number of tenants for which data is unavailable because they do not have the required licenses.

Quarantined messages page

From this page, you can view consolidated statistics across your customer tenants, trending data for the type and volume of quarantine data, and information related to quarantine queues in individual customer tenants.

The Status of messages section provides a consolidated view across eligible tenants currently onboarded to Lighthouse. The view includes

  • Total messages in quarantine
  • Total messages awaiting review
  • Messages that are currently approaching the default quarantine limit of 30 days and are about to be automatically removed (expire)
  • Messages that have been released from quarantine
  • Total number of mailboxes impacted across all your tenants

The data reflects the last 30 days; however, you can use the Time range filter to modify the view.

The Quarantine reason section contains a breakdown of quarantine counts by Exchange Online Protection (EOP) and Microsoft Defender for Office365 Plan 1 (MDO) policy type. These types include

  • Malware
  • Phishing
  • High Confidence Phishing
  • Spam
  • Bulk Email

The quarantine list is a sortable view of quarantine information by tenant. Within this view, you can filter by the following information:

  • Quarantine reason: Any, Malware, Phish, High confidence phish, Spam, Bulk Email
  • Policy type: Any, Anti-malware, Anti-phishing, Anti-spam, Safe Attachments, Transport Rule, Unknown
  • About to expire: Any, Today, within two days, within seven days

You also can adjust the columns and sort data based on tenant, message status, and expiration dates.

Screenshot of the Quarantined messages page.

The Copy Link to Messages in Microsoft 365 Defender option provides a link to Microsoft Defender portal where you can access and manage your tenant's email quarantine queue. You must authenticate before you can take any action.

Quarantined email messages (article)
Microsoft recommendations for EOP and Defender for Office 365 security settings (article)
Exchange Online Protection (EOP) overview (article)
Overview of the Threat management page (article)