Microsoft Purview eDiscovery Premium Implementation (2026)
Legal hold + custodian management + review sets + TAR analytics. Fixed-fee deployment tiers.
Last updated July 7, 2026 by Errin O'Connor, Founder & Chief AI Architect, EPC Group
Microsoft Purview eDiscovery Premium provides enterprise-grade legal hold + custodian management + review sets + Technology Assisted Review (TAR 2.0) + analytics + export. Bundled with M365 E5 or E5 Compliance add-on ($12/user/month). Compares favorably to Relativity for M365-heavy enterprises; Relativity remains stronger for law firms + heavy non-Microsoft sources. Implementation methodology: 14-19 weeks (discovery + configuration + custom workflows + training + pilot + handoff). Compliance frameworks satisfied: FRCP 26+37, FRE 502, HIPAA, SOC 2, GDPR, SEC 17a-4. EPC Group Foundation $75K-$150K/8-12wk; Managed Service $8K-$20K/mo.
Key Facts
- Purview eDiscovery Premium: legal hold + custodians + review sets + TAR 2.0 + analytics
- Licensed as M365 E5 or E5 Compliance add-on ($12/user/month)
- TAR 2.0 reduces reviewer hours 60-80% vs manual review
- Implementation: 14-19 weeks discovery + configuration + workflows + training + pilot
- Compliance frameworks: FRCP 26+37, FRE 502, HIPAA, SOC 2, GDPR, SEC 17a-4
- EPC Group Foundation: $75K-$150K / 8-12 weeks
Purview eDiscovery Premium FAQ
What is Microsoft Purview eDiscovery Premium?
Microsoft Purview eDiscovery Premium is the enterprise-grade eDiscovery platform inside the Microsoft 365 compliance stack. It provides: (1) Legal hold — preserve content across Exchange + SharePoint + OneDrive + Teams. (2) Custodian management — associate content with custodians + notify + track acknowledgments. (3) Search + review sets — collect content into isolated review workspaces. (4) TAR (Technology Assisted Review) — machine-learning-assisted document classification. (5) Analytics — near-duplicate detection, email threading, themes. (6) Export — legal-grade production to law firms. Licensed as Microsoft 365 E5 or E5 Compliance add-on ($12/user/month).
How does Purview eDiscovery Premium compare to Relativity?
Comparison: (1) Purview eDiscovery Premium — bundled with M365 E5, deeply integrated with Microsoft 365 sources, TAR built-in, cost ~$12/user/month. Best for: enterprises with 5,000+ M365 users where M365 is majority of source data. (2) Relativity — best-in-class litigation platform, connectors to many source systems including M365, more mature TAR + analytics + review workflow, cost typically $30-$60/user/month + hosting. Best for: law firms + eDiscovery service providers + enterprises with heavy non-Microsoft data sources. Enterprise M&A: many companies use Purview for internal investigations + smaller matters, Relativity for major litigation.
What are legal hold and custodian management?
Legal hold suspends deletion of specified content (mailboxes, SharePoint sites, OneDrive folders, Teams channels) so it cannot be modified or deleted for the duration of the hold. Custodian management: (1) Associate content sources with named custodians (users). (2) Send notice-of-hold emails to custodians requiring acknowledgment. (3) Track acknowledgment status + escalation. (4) Automatically place content-on-hold for custodian mailboxes + OneDrive + Teams chat. (5) Release hold when matter concludes. Legal hold + custodian management workflows are essential for defensible legal preservation + demonstrable compliance with FRCP + local court rules.
What is TAR (Technology Assisted Review)?
Technology Assisted Review (TAR) uses machine learning to accelerate document review by classifying documents as relevant/not-relevant/privileged based on reviewer decisions on a training set. Two flavors: (1) Predictive coding (TAR 1.0) — traditional supervised learning; requires larger training set. (2) Continuous active learning (TAR 2.0) — iterative learning during review; more efficient. Purview eDiscovery Premium implements TAR 2.0. Typical impact: 60-80% reduction in reviewer hours vs manual review. For matters with 100K+ documents, TAR is essential for cost-effective review. EPC Group eDiscovery engagements include TAR configuration + training + validation.
How do I implement Purview eDiscovery Premium?
EPC Group implementation methodology: (1) Discovery (2 weeks) — legal + IT stakeholder alignment, requirements gathering, current-state eDiscovery process. (2) Configuration (3-4 weeks) — role-based access, hold policies, notification templates, retention integration, custodian data source configuration. (3) Custom hold + review workflows (2-4 weeks) — matter templates, review set defaults, TAR configuration, export defaults. (4) Legal + IT training (2 weeks) — hands-on training for legal, ops team, IT admins. (5) Pilot matter (4-6 weeks) — run a real matter end-to-end + refine. (6) Handoff + runbook (1 week). Total: 14-19 weeks depending on complexity.
What are the compliance framework benefits?
Purview eDiscovery Premium satisfies: (1) FRCP Rule 26 + 37 — federal civil discovery rules for preservation + production. (2) FRE 502 — federal evidence rules for privilege waiver. (3) HIPAA Security Rule — audit + preservation controls for PHI-related discovery. (4) SOC 2 — access + change management. (5) GDPR Article 30 — record of processing activities. (6) State rules of civil procedure (state-specific). (7) SEC Rule 17a-4 — broker-dealer recordkeeping (with retention integration). EPC Group eDiscovery engagements include documentation of compliance framework alignment for legal + audit teams.
How does EPC Group price eDiscovery implementations?
EPC Group eDiscovery portfolio: (1) eDiscovery Premium Assessment ($20K, 3 weeks) — current-state process + gap analysis + implementation roadmap. (2) eDiscovery Premium Foundation ($75K-$150K, 8-12 weeks) — configuration + role setup + custodian data sources + notification templates + TAR configuration + legal + IT training. (3) eDiscovery Managed Service ($8K-$20K/month retainer) — ongoing eDiscovery matter support, custodian management, review support, quarterly compliance review. (4) Custom eDiscovery Program ($150K-$400K) — full custom implementation for regulated industries or complex custodian environments. All led by senior compliance architect with legal-team engagement.
eDiscovery Premium Assessment
$20K/3wk current-state + implementation roadmap. Call (888) 381-9725.
Phone
(888) 381-9725Business Hours
Monday-Friday, 8 AM - 7 PM CT
Quick Response Guarantee
We respond to all inquiries within one business day