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Security monitoring

See and act on risky activity across your Microsoft 365 estate

Risk in Microsoft 365 rarely arrives as an alert. It builds as configuration and sharing drift: a link shared too widely, an owner who left, a guest nobody re-checked. Rencore watches those changes across your estate, ranks them by severity, and puts the fix in front of an owner.

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The Rencore Governance dashboard for Microsoft 365: an inventory tile counting 1,150 users, 380 groups, 12 sensitivity labels, 13 subscriptions, 527 service assignments, 428 message center messages, 77 apps, 6,918 user activity records, 50 deleted users, 4 deleted groups and 3 rooms and equipment, each with its change over the period; a compliance summary donut at 81 percent with 949 high, 2,701 medium and 15 low violations against 16,307 compliant items; and policy cards for users with a Power Platform premium licence, external users with pending acceptance, and disabled user accounts at 110 violations found.

Trusted by the world’s leading organizations

  • MAPAL
  • bam
  • VDL
  • Wacker
  • Grundfos
  • Amgen
  • Lufthansa
  • thyssenkrupp
  • Sunrise
  • Pattern

The risky activity that hurts you

Most exposure in Microsoft 365 is not a breach, it is drift. These are the changes that quietly widen who can reach your data:

External sharing

Oversharing spreads quietly

A file goes out on a link with no expiry, then another, and the count climbs where no one is looking.

Permissions

Access widens without a trail

A site or group ends up owned by an external user, and the change lands with nothing flagging it.

Guest access

Guests accumulate

Guest accounts invited for one project stay long after it ends, still holding access to what they were shown.

Lifecycle

Workspaces go quiet, keep access

A site sits unused for months but keeps its members, its sharing links and its data, ready to be reached again.

You can only act on what you can see change

A single count of shares or permissions is not monitoring. Seeing the movement is: which exposure is new, which is climbing, and which one an owner needs to close first.

Why it stays invisible today

The changes are already happening in your tenant. They stay unseen because the tools that hold them were never built to watch them together:

Each admin surface shows a slice

SharePoint, Teams, Entra and Purview each report their own objects, so a change that spans them is nobody’s single view.

Nothing ranks the exposure

A raw list of shares and permissions does not tell you which one to act on first, so the urgent hides in the routine.

You see a number, not a trend

A count on its own hides the spike. Without the movement over time, a sudden jump in external sharing reads as normal.

No owner is on the hook

A finding with no named owner and no due date is a finding nobody closes, and it sits open until an audit finds it.

How Rencore watches your estate

Rencore monitors how your Microsoft estate is configured and shared, ranks every exposure by severity, and routes the fix to an owner. It complements the Microsoft controls you already run, Defender and Purview and Entra, and never replaces them.

Full-estate inventory

See the whole estate you have to watch

Every workspace, app, automation and agent in your tenant, in one scanned inventory with its owner and the data it can reach. You cannot monitor risk in a surface you cannot see, so monitoring starts here.

The Rencore Governance object inventory, expanded for Microsoft 365: 1,150 users, 380 groups, 12 sensitivity labels, 13 subscriptions, 527 service assignments, 428 message center messages, 77 apps, 6,918 user activity records, 50 deleted users, 4 deleted groups and 3 rooms and equipment, each row expandable to the objects behind the count.
Sharing exposure

Watch external sharing as it moves

A policy tracks files shared externally with no expiry or an expiry already past, counts the findings and charts the movement over three months, so a sudden spike shows on its own instead of hiding in a static total.

A Rencore Governance policy for SharePoint file sharing where the share is external and its expiration is missing or already past: a total of 13,566 findings, up 6,240 or 85 per cent, beside a three-month trend chart of total, new and removed findings, and the head of the findings table listing display name, item id, who shared the file and which user was invited.
Ranked by risk

Rank every finding by severity

Continuous policy monitoring evaluates your estate against the policies you switch on and ranks each violation high, medium or low, so the exposure that matters most sits at the top of the list, not buried in it.

The Rencore Governance Policies view for the Security category: a compliance score of 67 percent, up 21 percent over the period, and a Top Issues table ranking violations by severity: 13,566 SharePoint files shared with external users, 49 mailbox folders shared with default or anonymous users, 38 groups with external owners, 33 mailbox delegations granted to external users and 30 external sharing risks, each with its trend.
See it, then act

Put the fix in front of an owner

A finding is only useful if someone closes it. Recurring access reviews and automated remediation route each risky change to the owner who can decide, with a due date, so exposure gets confirmed or revoked instead of accumulating.

A Rencore Governance recurring review called Review all Teams that sends out a review to all teams and their responsible owners: a summary showing the object Teams, a manual trigger, a manual frequency and one action; a metrics panel with completion at 7 of 55 charted month by month; an automations panel listing a rule for when a review expires and one for when reviewers archive the object; and a table of its review cycles dated 30th of June 2026, 12th of June 2026 and 26th of May 2026, each Finished with its own completion bar.

Monitoring at a glance

The risky changes Rencore watches for, and the concrete signal behind each.

  • External sharing Sharing

    Links shared externally with no expiry, counted with the three-month trend.

  • Permission and ownership changes Access

    Sites and groups that end up owned by an external user, flagged and trended.

  • Guest access Guests

    Guest accounts that linger past pending acceptance or the project that invited them.

  • Dormant and new workspaces Lifecycle

    Sites unused for 90 days that still hold access, and new workspaces created without owners.

Continuous monitoring, severity ranking and an owner in the loop for the risky changes across your Microsoft estate.

This is policy-based monitoring of configuration and access, ranked by severity, not machine-learning anomaly detection or a real-time threat feed. It complements Microsoft Defender and Purview; it does not replace them.

Trusted by security, IT, and platform leaders

Security, IT, and platform leaders use Rencore to see their Microsoft estate, cut cost and risk, and roll out Copilot and agents on a governed foundation.

  • With Rencore's scalable automation solutions, organizations can not only meet current challenges but also prepare themselves for future technological advancements.
    Case Study
    Philipp Widmer Philipp Widmer Head of Platform Services Universitätsspital Basel

  • 26% vs 3%

    Organizations that govern Microsoft 365 well realize significant Copilot value 26% of the time, versus 3% for those that do not.

    Gartner, 2025 Microsoft 365 Copilot Survey
  • As we continue to expand our cloud capabilities, the foundation laid by Rencore Governance will undoubtedly play a crucial role in ensuring that each step forward is taken with confidence, security, and compliance in mind.
    Case Study
    Claude Bisdorff Claude Bisdorff Head of IT Systems Ville de Luxembourg

  • 116%

    ROI from Microsoft 365 Copilot once the program is adopted and governed, in Forrester’s Total Economic Impact study.

    Forrester Total Economic Impact
  • I currently estimate that we save around €80k per year by freeing up our IT admin team to do the work that counts.
    Case Study
    Undisclosed Undisclosed Former Lead O365 Competence Center Royal BAM

  • 71%

    of enterprises name security and governance among their top challenges to deploying Microsoft 365 Copilot.

    Gartner
  • Rencore's centralized governance tool excelled at ensuring secure data in Microsoft 365 and minimizing the risk of unauthorized access.
    Case Study
    Greg Bowles Greg Bowles IT Operations Manager Specialist Risk Group

  • 150,000+

    AI agents in use at the average Fortune 500 company by 2028. Agent sprawl is the next sprawl.

    Gartner
  • With Rencore Governance we are able to reduce manual governance activities, improve our service quality and generate valuable insights across our Microsoft service stack.
    Undisclosed Undisclosed Head of AI & Process Automation Wacker Chemie AG

Frequently asked questions

What counts as risky activity in Microsoft 365?
Rencore treats risky activity as the configuration and sharing changes that widen who can reach your data: files shared externally with no expiry, sites or groups that end up owned by an external user, guest accounts that linger past the project that invited them, and workspaces that go dormant but keep their members and access. Rencore monitors these against the governance policies you switch on and ranks each finding by severity. This is policy-based monitoring of configuration and access, not machine-learning anomaly detection.
Does this replace Microsoft Defender or Purview?
No. It complements them. Microsoft Defender watches for threats and identity signals, and Microsoft Purview classifies and protects the data itself. Rencore watches how your estate is configured and shared, ranks the exposure by severity, and routes the fix to an owner, running alongside the Microsoft controls you already have rather than in place of them.
How does Rencore detect a risky change?
Through continuous policy monitoring. Rencore ships more than 150 built-in governance policies, plus unlimited custom policies you define, and each one checks every object in your inventory on a schedule. It counts the violations, charts the three-month trend so a spike is visible, and ranks each finding high, medium or low. This is scheduled, continuous evaluation of your configuration and access, not a real-time SIEM alert stream.
What can it watch across the estate?
External and excessive sharing in SharePoint and OneDrive, groups and sites owned by external users, guest and external access, dormant workspaces, ownerless apps and agents, and Power Platform and Copilot risks, all in one ranked view. Microsoft 365 and Copilot is our deepest coverage today, with more services expanding.

Related reading

The neighboring Risk destinations go deeper on the changes this page watches. These cover the exposure next door:

Implement Microsoft Copilot governance the right way: 8 best practices

Read the article

AI governance for Microsoft 365: from Copilot risks to EU AI Act readiness

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Control access and oversharing across Microsoft 365

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Manage guest and external users

See the solution page

Get a full inventory of your tenant

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Improve your Secure Score for cyber insurance

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See the risky changes before an auditor does

Start with the inventory and the policies: every workspace, share and owner in your Microsoft tenant, ranked by severity, with the fix routed to the person who can close it.

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The Rencore Governance compliance summary for Microsoft 365 Copilot: a donut at 75 percent, with 9 high, 865 medium and 0 low violations against 2,652 compliant items, and an information row at 0.