Migrating from Exchange Server 2019 to Office 365 offers organizations the flexibility, scalability, and cloud advantages needed in today’s modern workplace. However, planning a secure and efficient migration requires the right approach, tools, and timing.
Whether you're handling a few mailboxes or an enterprise-level migration, it's essential to choose a solution that minimizes downtime, maintains data integrity, and supports large mailboxes with ease.
For a reliable and streamlined experience, consider using a professional solution like the Shoviv Exchange Migration Tool. It supports Exchange to Office 365, Exchange to Exchange, and even Office 365 tenant-to-tenant migrations—all from one unified dashboard.

https://www.shoviv.com/exchange-migration.html

Need step-by-step guidance?
Check out this detailed blog on the subject:

https://www.shoviv.com/blog/exchange-2019-to-office-365-migration/