Email Migration

How to Test-Migrate a Litigation Hold Mailbox to Microsoft 365

Maira Mehtab Sep 22, 2026 868 views

Question details

An organization needs to test the migration of a litigation-hold mailbox from Exchange 2016 to Microsoft 365 without impacting active employee mailboxes.

Product: Exchange 2016 / Microsoft 365
Device & OS: not provided
Scenario: Migrating mailboxes in a hybrid Exchange environment and needing to validate the migration process for accounts on litigation hold.
Observed behavior: Seeking a safe method or dummy mailbox setup to test the compliance migration workflow.

Before you start

Ensure you have Global Administrator or Exchange Administrator privileges in both your on-premises environment and Microsoft 365 tenant.

Solution 1Recommended

Consult Microsoft FastTrack and Q&A Teams

Because migrating litigation-hold mailboxes involves strict compliance requirements, the most reliable approach is to consult specialized Microsoft migration teams for approved test scenarios.

Testing hybrid migrations for mailboxes on litigation hold requires careful planning to ensure compliance data is not compromised. Instead of using active employee accounts, Microsoft recommends relying on specific test-mailbox procedures validated by their migration specialists.

Access Microsoft Q&A

Navigate to the official Microsoft Q&A website and sign in with your organizational administrator account.

Post Your Migration Scenario

Create a new thread under the Exchange Server or Microsoft 365 migration tags, detailing your Exchange 2016 hybrid setup.

Request Test Procedures

Specifically ask the specialized migration team for safe dummy-mailbox options and litigation hold considerations.

Leverage Microsoft FastTrack

If your organization is eligible, log into the Microsoft FastTrack portal to request direct deployment and migration assistance.

Exchange Version Considerations: The specialized team can also clarify whether your specific Exchange 2016 Cumulative Update (CU) version impacts the migration process.

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Frequently Asked Questions

What is a litigation hold in Exchange?

A litigation hold preserves all mailbox content indefinitely or for a specified duration, including deleted items and original versions of modified items, to meet legal discovery or compliance regulations.

Why shouldn't I use an active employee's mailbox to test litigation hold migrations?

Testing on an active mailbox is not recommended because it could disrupt the employee's work, lead to unintended data loss, or cause compliance violations during the migration test phase.

Can I create a dummy user just for testing litigation hold migration?

Yes, creating a dedicated dummy mailbox and placing it on litigation hold before running a migration batch is generally the safest way to validate the hybrid move process without risking real compliance data.

Migration & Recovery