What happens when a regulator requests company records, HR launches an investigation, or legal teams need to preserve critical evidence? Searching through Outlook mailboxes, Teams chats, SharePoint sites, and OneDrive folders manually is slow, error-prone, and often impossible at enterprise scale. In this episode of Microsoft Knowledge Nuggets on M365.fm, Mirko Peters explains Microsoft Purview eDiscovery in plain English. You'll learn how organizations can securely discover, preserve, review, and export Microsoft 365 data using a structured, case-based process that supports legal investigations, compliance requests, internal audits, HR matters, and security incidents. Whether you're an IT administrator, Microsoft 365 consultant, compliance officer, security professional, or simply preparing for Microsoft certifications, this episode provides a practical introduction to one of the most important Microsoft Purview capabilities.

WHY eDISCOVERY MATTERS IN MICROSOFT 365
Modern work is scattered across multiple Microsoft services. Business conversations no longer live only in Outlook. Critical evidence may be spread across:

• Exchange Online emails
• Microsoft Teams chats and meetings
• SharePoint Online document libraries
• OneDrive for Business
• Microsoft 365 Groups
• Viva Engage conversations

During an investigation, missing even one location can result in incomplete evidence. Microsoft Purview eDiscovery provides a centralized process that helps organizations collect the right information while maintaining security, privacy, and governance. Instead of searching every mailbox and document library, organizations create structured cases that define exactly what should be searched and who may access the results.

HOW MICROSOFT PURVIEW eDISCOVERY WORKS
Rather than acting as a giant search engine, eDiscovery follows a carefully controlled workflow. The process begins by creating a case, which becomes the secure workspace for a specific investigation. Authorized users define the data sources, preserve evidence through Legal Hold when required, execute targeted searches, review the collected results, classify relevant documents, and finally export only the approved evidence. This structured workflow dramatically reduces risk compared to manually searching Microsoft 365 services while providing a clear audit trail for compliance and legal teams.

EXPLORE THE COMPLETE eDISCOVERY WORKFLOW
This episode explains every major component of Microsoft Purview eDiscovery, including:

• Creating investigation cases
• Selecting Exchange, Teams, SharePoint and OneDrive data sources
• Understanding Legal Hold
• Running targeted searches
• Using Keyword Query Language (KQL)
• Reviewing collected evidence
• Working with Review Sets
• Applying Tags
• Exporting evidence securely
• Managing permissions and access control
• Understanding Standard vs Premium eDiscovery

Every topic is illustrated using practical business scenarios that demonstrate how investigations typically unfold inside Microsoft 365 environments

LEGAL HOLD EXPLAINED
One of the most misunderstood concepts in Microsoft Purview is Legal Hold. A Legal Hold ensures that potentially relevant information remains preserved even if users delete emails, edit documents, or leave the organization during an active investigation. Unlike traditional retention policies, which enforce normal business record retention, Legal Hold protects data because of a specific legal or compliance matter. This episode explains:

• when Legal Hold should be used,
• how it differs from Microsoft 365 retention,
• why preservation must happen before searching,
• and why only authorized business stakeholders should decide when a hold is applied or released.

SEARCH SMARTER — NOT WIDER
Many administrators assume that searching the entire Microsoft 365 tenant is the safest option. In reality, enterprise investigations work best when searches remain focused. You'll learn how to:

• define relevant custodians,
• limit searches using date ranges,
• search by sender or recipient,
• use keywords effectively,
• understand Keyword Query Language (KQL),
• analyze search statistics,
• refine search queries iteratively,
• and avoid collecting unnecessary personal or business information.

The episode demonstrates why successful investigations begin with focused questions instead of massive searches.

REVIEW, CLASSIFY AND EXPORT EVIDENCE
Finding information is only the beginning. Microsoft Purview eDiscovery enables reviewers to examine search results, determine relevance, classify documents using tags, and prepare evidence for legal or compliance teams. You'll discover:

• what Review Sets are,
• how reviewers organize findings,
• when Premium review capabilities become valuable

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