November | 2015 | Jaap Wesselius

Before you start moving mailboxes you have to make sure that all accepted domains used by mailboxes on-premises are configured in Office 365. This can be tricky, you wouldn’t be the first admin that experience failed migration because of a domain.local email address on an on-premises Mailbox J

Now, when you want to move a mailbox from Exchange on-premises to Exchange Online, navigate again to the Exchange Admin Center, and under recipients select migration. Click the + icon and select migrate to Exchange Online to start the new migration batch wizard.

For the migration type, select Remote move migration which is supported by Exchange 2010 or later.

Click Next to continue. Select the mailboxes you want to migrate to Exchange Online, you can use the people picker feature (click the + icon under Select the users that you want to move) for this, or you can use a CSV file to select the mailboxes you want to move.

Continue reading Moving Mailboxes in a Hybrid Configuration – Part II →

In three earlier blog posts I explained how to implement directory synchronization and how to create an Exchange hybrid configuration:

Implementing Directory Synchronization – https://jaapwesselius.com/2015/05/13/implementing-directory-synchronization/
Exchange 2013 Hybrid Prerequisites (Part I) – https://jaapwesselius.com/2015/07/02/exchange-2013-hybrid-prerequisites-part-i/
Exchange Hybrid Configuration Wizard (Part II) – https://jaapwesselius.com/2015/07/03/exchange-2013-hybrid-configuration-wizard-part-ii/

These steps will create a hybrid configuration between your on-premises Exchange 2013 environment an Exchange Online, but to move mailboxes from Exchange on-premises to Exchange online (or vice versa) you need to create an endpoint. This an on-premises Exchange 2013 server (but it can be more) where the Mailbox Replication Service (MRS) is running, used to move mailbox data from one server to another. The process is similar to an on-premises mailbox move where the MRS is responsible.

Create a migration endpoint

To create an endpoint you have to go to the Exchange Admin Center in Office 365 and login as an Office 365 tenant administrator. You can get there via the Microsoft Online Portal, select Admin | Exchange, or navigate directory to the Exchange Admin Center, and login as an Office 365 tenant administrator.

In the Exchange Admin Center dashboard, under Recipients select migration. At this point an empty screen will be shown: