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Migrating from on-premises Exchange to Microsoft 365

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Migrating from on-premises Exchange to Microsoft 365

How to move mailboxes from Exchange Server to Exchange Online — the migration types, hybrid deployment, and the realistic plan.

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01

The four main migration types

### 1. Cutover migration

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02

What needs to happen

Regardless of migration type, the typical steps:

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03

Co-existence period

During hybrid migration, both Exchange Online and Exchange Server are live. Mail flows between them transparently. Users in the cloud calendar correctly with users on-prem. The co-existence can last weeks or months.

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04

Decommissioning on-premises Exchange

After all mailboxes are in Exchange Online, the on-premises Exchange Servers can be mostly decommissioned. Microsoft historically required keeping at least one Exchange server for managing mail-attribute objects on AD-s…

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05

Common pitfalls

For most organisations, a hybrid migration over 2–6 months is the right answer. The work is well-understood, the tooling is mature, and the destination is meaningfully better than running your own mail.

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/migrating-from-on-premises-exchange-to-microsoft-365

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