Read time: 5 min
Mergers & acquisitions involve much more than just combining two organizations together. Behind every successful business merger, there is a carefully planned IT integration strategy, especially when both the companies rely on Microsoft 365.
Mergers & acquisitions involve much more than just combining two organizations together. Behind every successful business merger, there is a carefully planned IT integration strategy, especially when both the companies rely on Microsoft 365.
A poorly planned Microsoft 365 merger strategy can lead to data loss, licensing conflicts, security gaps, and user disruption. That’s where IT due diligence checklist plays an important role before any tenant consolidation starts.
Why Does IT Due Diligence Matters Before Microsoft 365 Merger?
Microsoft 365 stores years of important data across multiple services like Exchange Online, SharePoint Online, OneDrive, Microsoft Teams, Microsoft Entra ID (Azure AD), etc. Without proper analysis, organizations may face:
- Duplicate user identities
- Broken permissions
- Chats disappear in Microsoft Teams
- Inaccessible SharePoint sites
- Email delivery issues
- Compliance violations
- Security vulnerabilities
- Unexpected licensing costs
Objectives of Microsoft 365 IT Due Diligence
The following are the primary goals of Microsoft 365 IT due diligence:
- Understand both Microsoft 365 tenant environments
- Identify technical incompatibilities
- Review compliance requirements
- Estimate migration complexity
- Data governance in Office 365
- Prepare a realistic migration timeline
- Reduce business disruption
- Prevent data integrity issues
Complete Microsoft 365 IT Due Diligence Checklist
Execute a detailed M&A IT due diligence checklist to review & investigate several key areas of Microsoft 365 environment:
Document Entire Microsoft 365 Environment Details
Start by documenting everything that exists in both of your Microsoft 365 tenants, including total users, guest users, Shared mailboxes, resource mailboxes, distribution lists, Microsoft 365 Groups, dynamic groups, Teams, SharePoint sites, OneDrive accounts, etc.
After collecting all the necessary information, now you need to find out:
- How many active users exist?
- Which workloads are actively used?
- Which resources are obsolete?
- What needs to be migrated?
Assess Microsoft Entra ID Configuration
Identity management becomes one of the biggest challenges during mergers & acquisitions. Before consolidation, evaluate both tenants to identify security groups, administrative roles, authentication methods, Conditional Access Policies, Self-Service Password Reset, MFA implementation, enterprise applications, duplicate UPNs, duplicate SMTP addresses, & conflicting domains.
Review Domain Ownership
Every Microsoft 365 environment uses verified domains. Reviewing your domain’s ownership helps in securing your digital footprint. Check accepted domains, primary email domains, vanity domains, DNS ownership, SPF, DKIM, DMARC, and MX records.
Review Security Configuration
Security differences between tenants can create major risks. Every organization must review MFA adoption, Conditional Access, Microsoft Defender policies, Safe Links, Safe Attachments, Anti-phishing policies, device compliance, and risk policies.
Verify Compliance & Governance
Regulated organizations must preserve compliance during M&A and establish a unified compliance. Verify retention labels, retention policies, eDiscovery cases, legal holds, Microsoft Purview configuration, audit logs, Information Protection labels, Data Loss Prevention policies, and Insider Risk Management to successfully execute governance throughout the merger & acquisition.
Review Licensing
Licensing differences often increase migration costs. And a successful tenant consolidation requires proper auditing to avoid the overlapping of licensing costs. Make sure you verify Microsoft 365 Business licenses, Enterprise licenses, add-on subscriptions, Defender licenses, Power Platform licenses, unused licenses, and duplicate subscriptions.
Analyze Storage Requirements
Analyzing storage requirements is critical to map data accurately, prevent disruptions during migrations, & optimize licensing costs. Estimate migration volume by measuring Exchange storage, SharePoint storage, OneDrive storage, Teams file storage, and Archive mailboxes. This helps in estimating migration duration, bandwidth requirements, & storage planning.
Identify Potential Risks
Failing to identify risks properly can lead to many operational faults and data loss. Create a detailed list of risks covering duplicate user identities, login failures, domain conflicts, email disruption, missing licenses, service interruption, broken permissions, unauthorized access, compliance issues, regulatory penalties, unsupported applications, business downtime, large mailbox sizes, and extended migration windows.
Common Mistakes During Microsoft 365 Mergers
When organizations undergo consolidation, they need to properly follow the mergers and acquisitions data compliance checklist. If you don’t follow it, then there are high chances that you may make some mistakes, such as:
- Ignoring inactive user accounts
- Migrating unnecessary data
- Forgetting shared mailboxes
- Overlooking Teams private channels
- Not validating permissions
- Skipping pilot migrations
- Failing to communicate with end users
Simplifying Tenant Consolidation After Due Diligence
Once the analysis phase is complete, the next challenge is performing the migration while preserving data integrity. At this stage, many organizations look for specialized migration solutions that support Microsoft 365 tenant to tenant migration.
Kernel Cloud Tenant Migration Tool is designed to directly migrate data from one Microsoft 365 tenant to another. It allows you to migrate bulk data while tracking real-time progress. You can even perform an incremental migration to avoid data duplicity in the destination tenant. Further, it comes with multiple filtering options to migrate specific data based on date filters, folder or file filters, items, & more.
Ending Note
Microsoft 365 merger and acquisition is not just simply moving data from one tenant to another. It requires a detailed understanding of identities, workloads, security, compliance, licensing, & business dependencies. By following a structured checklist and preparing a proper migration strategy, IT teams can merge Microsoft 365 Tenants smoothly with minimal disruption.
