Microsoft 365 and Active Directory Migration Case Studies

LeadThem Consulting is a Microsoft 365 and Active Directory migration specialist. We've delivered tenant-to-tenant consolidations, hybrid Exchange transitions, domain rewrites, and Active Directory disaster recovery deployments for organizations across higher education, financial services, healthcare, media, manufacturing, logistics, and law. Each case study below is a real engagement, with the technical challenges, solutions, and outcomes.

Every migration is bundled with knowledge transfer and product training delivered by the team that develops Quest Software's official training catalog, so your internal team owns the platform once we are done.

Authored by Jim Ruder, COO at LeadThem Consulting, drawing on 250+ enterprise migration projects delivered across a career in Microsoft identity and messaging platforms.

Microsoft 365 and Active Directory migrations

Cross-Tenant Microsoft 365 Migration for a Global University System

Higher education · 500 users · 4 months

Multi-tenant Microsoft 365 consolidation including mailboxes, OneDrive, Teams chats, and Entra ID-joined campus workstations, with cross-tenant coexistence preserved through the cutover.

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Active Directory and Microsoft 365 Migration for a Global Financial Services Firm

Financial services · 541 users · multi-domain · ahead of schedule

Cross-domain Active Directory synchronization and Microsoft 365 migration for a multinational financial institution, finished ahead of schedule with zero authentication disruptions.

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Hybrid Exchange and Microsoft 365 Migration for a Global Media Enterprise

Media and entertainment · 14,000+ users · 8 months · global

Hybrid Exchange migration, Teams rollout, and Entra ID consolidation for a globally recognized media organization, sustained across an 8-month engagement with multi-domain SMTP routing maintained throughout.

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Domain Rewrite and Microsoft 365 Migration for a Commercial Real Estate Firm

Commercial real estate · 900+ users · UPN and SMTP rewrite · hybrid Exchange

Domain rewrite migration touching every UPN, SMTP address, and proxyAddress attribute, with hybrid Active Directory and Exchange coexistence maintained throughout.

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Active Directory Discovery and M365 Migration Assessment for an Enterprise Technology Company

Enterprise technology · enterprise-scale environment · 2-week assessment · CDS deliverable

Active Directory discovery and Microsoft 365 readiness assessment delivered as a Custom Deployment Solution document, with environment audit, risk register, and migration blueprint.

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Multi-Entity Domain Rewrite and Microsoft 365 Migration for a National Healthcare Organization

National healthcare · 16,000 users · multi-entity

Multi-entity domain rewrite, Exchange mail flow separation, and Microsoft 365 consolidation across a healthcare enterprise with multiple subsidiary tenants and HIPAA-sensitive mail routing.

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Hybrid Active Directory and M365 Big Bang Migration for a Global Consumer Goods Company

Consumer goods · 250 users · divestiture · no-trust cutover

Big Bang Active Directory and Microsoft 365 migration with no domain trust, no SID history, and no password sync, executed as part of a corporate divestiture across multiple countries.

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Multi-Portfolio Microsoft 365 Migration for a Private Equity Firm

Private equity · 120+ users · 3 portfolio companies · 3 continents

Simultaneous Microsoft 365 migrations across three portfolio companies in North America, Europe, and the United Kingdom, with archive mailboxes, litigation holds, and hybrid device migration.

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Semiconductor Acquisition M365 Migration with Purview-Encrypted Data

Semiconductor · 365+ users · acquisition · Purview/AIP-encrypted data

Cross-tenant Microsoft 365 acquisition migration with Purview/AIP sensitivity labels tripling sync times, ITAR-regulated file server migration, and shared factory-floor PC cutover.

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Enterprise AD Migration and Office 365 Cross-Tenant Migration for a Global Logistics Company

Global logistics · 6,500 users · corporate separation

Enterprise Active Directory migration and Office 365 cross-tenant migration with comprehensive discovery, Group Policy parity, and disaster recovery protection throughout cutover.

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Active Directory disaster recovery and identity security

RMAD-DRE Forest Recovery, Change Auditor, and GPOADmin Deployment for a Regional Credit Union

Regional credit union · 9,150 users protected · 2 data center sites · NCUA-regulated

Active Directory disaster recovery deployment with multi-site Secure Storage, validated Phase 1 and Phase 2 forest recovery, real-time change auditing, and Group Policy management modernization.

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RMAD-DRE Upgrade and Forest Recovery Validation for a Global Law Firm

Global law firm · 2,500+ attorneys · multi-continent · 8-day engagement

Legacy Recovery Manager for Active Directory upgraded to RMAD-DRE 10.3.2, with forest recovery validated against the firm's actual topology and backup portability tested across storage locations.

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