How Much E-Discovery Can You Do with Microsoft Office 365?

If you’re working in e-discovery today, it’s highly likely you’re dealing with Microsoft Office 365 data. Office 365 is one of the most widely used enterprise cloud platforms, with over 90% of organizations having at least 100 users. The data stored there is also highly relevant to litigation, with reports estimating that more than half of sensitive cloud data resides in Office documents.

Microsoft has continued to enhance its e-discovery capabilities within its E3 and E5 enterprise offerings. For some organizations—particularly those operating almost entirely within the Microsoft ecosystem—these tools may be sufficient. However, most enterprises must evaluate several factors before relying solely on Office 365 for e-discovery.

Evaluate Existing Preservation Policies and Procedures

As technology evolves, so do court expectations. With in-place preservation tools now widely available (including those in Office 365), organizations are increasingly expected to preserve data proactively across its lifecycle—especially in highly regulated or litigation-prone industries.

Understand the E-Discovery Implications of Your Preservation Strategy

Office 365 allows organizations to either preserve specific search results or preserve all custodian data. While the common approach is to “over-preserve but under-collect,” there may be situations where alternative strategies are more appropriate.

The key to defensibility is consistency. Courts are more likely to view your actions as good faith efforts if you follow a well-documented and consistently applied preservation process.

Account for Data Outside Office 365

This is a critical consideration. A significant portion of business data exists outside Office 365, including:

• Workstations
• Servers
• Mobile devices
• Other cloud platforms

All of these sources may contain relevant electronically stored information (ESI). Office 365 tools alone cannot identify or preserve data stored outside the Microsoft ecosystem, so your e-discovery strategy must account for these additional sources.

Make an Informed Decision About Advanced Features

Office 365 E3 provides basic e-discovery functionality, such as in-place preservation for emails and documents. More advanced features—like near-duplicate detection, email threading, and predictive coding—are available in E5 or as add-ons.

However, these features are not a complete replacement for dedicated e-discovery platforms. They typically do not support:

• Comprehensive legal hold management
• Pre-collection data analysis
• End-to-end workflow management across teams

If your organization already uses specialized e-discovery software, some Office 365 advanced features may be redundant.

Will You Need Multiple E-Discovery Processes?

Because most organizations store data both inside and outside Office 365, separate processes may be required to identify and preserve all relevant ESI.

This may be manageable for organizations with limited data sources or infrequent legal matters. However, for those with multiple data repositories, numerous custodians, or concurrent cases, managing separate processes can quickly become complex and inefficient.

Conclusion

Successful e-discovery depends on having defensible, repeatable processes and a clear understanding of your data sources—whether they reside in Office 365 or elsewhere.

Making informed decisions about your tools and strategies is essential to meeting your legal obligations efficiently and effectively.