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Microsoft Office 365: Exchange Online Implementation and Migration by Loryan Strant, David Greve

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Changing your MX record in a Hybrid configuration

At some point you will want to consider moving your inbound mail routing from your on-premise mail system to Office 365's ForeFront Online Protection for Exchange (FOPE) If you do not have any on-premise gateway mail routing requirements, you may want to consider this move when most of your mailboxes are in Office 365. If you plan to do a flash cutover, then you may want to consider the MX change right away.

Moving your MX record does not mean on-premise mailboxes will stop receiving e-mails, this is why the Hybrid option is available for Exchange on-premise organizations. You may have other on-premise mail routing requirements, which should be evaluated before changing your MX record.

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