Take a look and decide whether this affects your tenant, users or support teams.
Primary Audience
Why this score?
AT A GLANCE
END USERS
IT ADMINS
ROLLOUT TIMELINE
Late October 2026
📢 Official Microsoft Message Center Announcement
(Updated) Microsoft Defender for Office 365: New email submissions data in Advanced Hunting
Message ID: MC1484009 (Updated)
Updated October 9, 2026: We have updated the timeline. Thank you for your patience.
[What and Why:]
Microsoft Defender for Office 365 is introducing new email submissions data in Advanced Hunting in Microsoft Defender. The new submissions tables provide security operations teams with greater visibility into email submission activity and results, enabling analysts to query submission activity alongside other Defender data and build hunting and detection workflows tailored to their organization.
[Rollout Schedule:]
Public Preview (Worldwide): We will begin rolling out in early October 2026 and expect to complete by early October 2026.
General Availability (Worldwide): We will begin rolling out late October 2026 (previously early October) and expect to complete by mid-November 2026 (previously early October).
[Impact on Your Organization:]
Who is affected:
– Security operations teams that use Advanced Hunting in Microsoft Defender.
– Admins and analysts who investigate email submissions and submission results.
Platforms/Services:
– Microsoft Defender for Office 365
– Microsoft Defender XDR
– Advanced Hunting
What will happen:
– Two new Advanced Hunting tables will be available: SubmissionEvents and SubmissionResults.
– SubmissionEvents provides information about email submission events.
– SubmissionResults provides information about the results associated with those submissions.
– Security teams can query submission information directly and correlate it with other Microsoft Defender XDR data.
– The tables can be used with Advanced Hunting custom detections, allowing organizations to create detections based on submission activity that is important to their SOC workflows.
[Action Required/Recommendations:]
No immediate action is required. Additional documentation for the new tables will be provided as part of the release.
[Compliance considerations:]
No compliance considerations identified. Review as appropriate for your organization.
Source: Microsoft Message Center • Analysed by MWPro
<<< [MC1484009] Archive
Tooltip: View earlier revisions of this post
