Shared mailboxes are often used by legal teams to manage client inquiries, case updates, billing communication, and general office correspondence. When a firm moves to a new Microsoft 365 tenant, these mailboxes need special attention because several employees may depend on the same information throughout the day.

During an Office 365 Tenant Migration for Law Firms, I would begin by listing all shared mailboxes and identifying who needs access to each one after the move. It is also worth checking mailbox contents, relevant attachments, and any retention requirements before the migration starts. This preparation can help prevent confusion when employees begin using the destination tenant.

The SysInfo Tenant to Tenant Migration Tool supports the migration of primary mailboxes, shared mailboxes, online archives, and public folders. Its mapping options can help administrators assign source data to the intended destination accounts. Before moving every mailbox, I would test a smaller selection and confirm that the expected emails and folders are available after the transfer.

Permissions deserve equal attention. Moving mailbox data does not remove the need to review who should be able to open or manage the destination mailbox. IT teams should verify access for attorneys, paralegals, and administrative staff according to the firm's requirements.

A well-planned Law Firm Microsoft 365 Migration should also include a communication plan. Employees need to know when the mailbox will be available in the new environment and where to report missing messages or access problems. Reviewing migration reports and checking important conversations can help identify issues before the project is considered complete.

For those who have migrated shared mailboxes in a legal environment, how did you handle access permissions and user validation? Did you migrate all shared mailboxes together or prioritize them according to business needs?

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