Investigate a suspected Exchange breach by coordinating security, Exchange, identity, operations, and legal stakeholders; preserving relevant evidence before broad cleanup; scoping any connected Microsoft 365 identities and services; and then containing, eradicating, and recovering from the threat. Avoid response actions that could destroy evidence or unnecessarily disrupt critical services. If an urgent containment action cannot wait, document what changed and why.
How should you organize the response?
Use your organization’s incident-response process rather than treating the incident as an isolated mailbox or server problem. Coordinate the security team with Exchange administrators, identity and operations teams, and legal counsel. Microsoft advises involving legal counsel to help determine whether law enforcement may be involved and how the investigation and recovery should be planned. Keep incident communications controlled and follow legal advice about what to share. Microsoft’s incident response overview emphasizes avoiding loss of data, business-critical functionality, and evidence.
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Set a response lead and a shared incident record so investigators and administrators can coordinate. Record significant decisions and changes, including who made them, when, what was affected, why the action was necessary, and its result. If containment cannot wait for evidence collection, note the trade-off and preserve what is reasonably available first.
What should you preserve before making broad changes?
Prioritize systems and accounts with evidence of attacker activity
Do not investigate or alter every resource indiscriminately. Start with systems, accounts, and resources that available evidence indicates an attacker used or modified. Where practical, use tools already deployed in the environment. Plan containment and remediation so they do not create avoidable evidence loss; document necessary changes in the incident record. Microsoft’s incident response guidance discusses prioritization and preserving data, functionality, and evidence.
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Retain suspicious messages and indicators
Before deleting or cleaning up suspected phishing or attack emails, save copies of the original messages for analysis. The original may retain useful headers, content, scripts, or attachments. Record relevant indicators of compromise—such as file hashes, malicious IP addresses, and email attributes—when applicable, in the organization’s threat-intelligence or incident-response systems. Microsoft’s incident response overview covers preserving attack emails and recording indicators.
How can you preserve Exchange mailbox material?
Exchange Server’s Recoverable Items folder and related features can support retention and investigation, but their usefulness depends on the environment’s configuration, scope, permissions, and retention behavior. Microsoft describes the folder as a way to protect against accidental or malicious deletion and facilitate discovery during investigations or litigation in its Recoverable Items folder documentation.
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- Recoverable Items and deleted-item retention: May retain deleted material, subject to configuration and applicable retention behavior.
- Single-item recovery: Can support recovery of individual deleted items when configured and available.
- In-Place Hold and Litigation Hold: Can preserve mailbox items; In-Place Hold can preserve items matching query parameters. Confirm the relevant hold, scope, and configuration before relying on it.
- Mailbox and calendar auditing: May provide activity information if logging was enabled and the relevant records are available.
Check which Exchange environment and version is involved, which mailboxes and items are in scope, whether holds or retention policies already apply, and whether the needed audit records exist. Do not assume a feature was enabled or that it covers every relevant item. Microsoft’s Exchange Server In-Place eDiscovery documentation discusses preserving mailbox content, including messages deleted or altered by users or processes. It does not replace current legal or organization-specific direction about how long material must be preserved.
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What if Exchange is hybrid or connected to Microsoft 365?
Include identity and trust relationships in the scope when on-premises Exchange is connected to Microsoft 365. An on-premises compromise may put cloud environments at risk through federation or synchronized accounts. Determine whether those paths exist in your architecture and whether the affected identities or services show signs of attacker access. Microsoft’s guidance on protecting Microsoft 365 from on-premises attacks explains these relationships; it is architecture guidance, not a step-by-step Exchange forensic checklist.
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How should you contain, recover, and close out the incident?
Contain and eradicate based on the evolving evidence
Use the incident-response lifecycle of analysis, containment, eradication, and recovery. Choose actions that address the observed threat while accounting for operational impact and evidence preservation. Microsoft describes this lifecycle in its security incident detection and analysis guidance and security incident management overview.
Verify recovery and document what is known
After recovery, verify that services are functioning and that signs of compromise are no longer present. Prepare an evidence-supported technical summary and event sequence that records relevant indicators, response actions, unresolved questions, and lessons learned. Note vulnerabilities that are unknown or unpatched and gaps in the response process for follow-up. Microsoft describes post-incident documentation and lessons learned in its post-incident activity guidance.
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Which Microsoft guidance applies only to particular situations?
- Compromised mail-flow connector: Microsoft’s compromised connector instructions address Microsoft 365 mail-flow connectors, including connectors linking cloud mail flow with on-premises servers. Use them only if that connector scenario is relevant; they are not a general forensic procedure for an on-premises Exchange server.
- Purging messages: Microsoft Purview Data Security Investigations documents soft and hard purge actions. Purging is remediation, not evidence collection. Microsoft recommends soft purge as the default in most investigation-driven workflows because items may remain recoverable subject to retention; hard purge is irreversible. Do not purge suspected evidence without appropriate scope, authority, and preservation review. See Microsoft’s mitigation-actions documentation.
- Malicious-application investigation: Microsoft’s malicious-application playbook illustrates why prerequisites, logging, and permissions matter, but it is not Exchange-specific.
The Microsoft guidance cited here does not provide a complete, version-specific Exchange forensic acquisition sequence, a full list of relevant logs, or jurisdiction-specific evidence-handling requirements. For an active incident, consult current Microsoft incident-response support and qualified forensic and legal professionals for procedures appropriate to your environment and obligations.
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