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Exchange hybrid deployment

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Exchange hybrid deployment

How hybrid Exchange works — connecting on-prem Exchange Server with Exchange Online, what the wizard actually does, and the path off the last server.

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/exchange-hybrid-deployment

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01

What hybrid provides

Once configured:

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/exchange-hybrid-deployment

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02

What's required

The HCW deserves demystifying, because it looks like magic and is actually bookkeeping: it creates and configures send/receive connectors on both sides, sets up the federation trust and organisation relationships for fr…

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/exchange-hybrid-deployment

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03

Full vs minimal hybrid

Choose minimal if the migration project has an end date this fiscal year; choose full if coexistence will outlive anyone's patience. There's also Exchange Modern Hybrid, which uses a Microsoft-published agent to avoid i…

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/exchange-hybrid-deployment

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04

Migration patterns

The broader project — licensing, DNS cutover, client rollout — is covered in the guide on migrating from on-premises Exchange to Microsoft 365.

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/exchange-hybrid-deployment

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05

The last Exchange server problem

Here's the part that surprises people: after the last mailbox moves to the cloud, you usually can't just turn off Exchange on-prem. While Entra Connect syncs your AD to the cloud, the on-prem Active Directory remains th…

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/exchange-hybrid-deployment

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06

Practical advice

Hybrid Exchange is mature, well-trodden technology. The failure mode isn't technical — it's the migration that never quite finishes.

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/exchange-hybrid-deployment

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