Hey all,

I wanted to start a discussion around one of the biggest challenges IT admins face today: migrating from Exchange Server 2019 to Office 365 (Microsoft 365) while minimizing downtime and keeping users productive.

From what I’ve learned, there are a few main strategies admins typically consider:

• Manual migration methods – cutover, staged, or hybrid setups. These can work, but they’re often complex, time-consuming, and require strong PowerShell skills. Downtime is also a risk if things don’t go as planned.
• Hybrid Exchange deployments – good for larger organizations that want coexistence between on-prem Exchange 2019 and Office 365. But again, configuration can be tricky and requires proper planning.
• Third-party migration tools – designed to save time and reduce risk. For example, tools like the Shoviv Exchange Migration Tool simplify mailbox moves, support incremental migration, handle public folders/archives, and ensure zero downtime during cutovers.

Key factors I think are worth discussing:

• How to avoid downtime during large mailbox migrations.
• Handling public folders, archive mailboxes, and permissions.
• When it makes sense to go manual vs. automated.
• Real-world experiences with Exchange 2019 to Office 365 migrations.

I’d love to hear from folks who’ve already made the move:

• Did you stick to manual PowerShell/EAC methods, or did you use a tool to speed things up?
• What strategies helped you save time and keep email services running smoothly?
• Any pitfalls you’d warn others about before they start?

Looking forward to your insights it’ll be super useful for anyone planning their Exchange 2019 to Microsoft 365 migration this year.