Hybrid Management - Part 06 - Bulk mailbox moves via the EAC

Welcome to my tutorials on Hybrid Exchange - Office 365 Administration -

All Hybrid Administration Tutorials
- How to configure your desktop PC for Hybrid Exchange - Office 365 - Azure Administration - Link
- How to connect to Hybrid Exchange - Office 365 - Azure AD and Local AD via PowerShell - Link
- Hybrid Management - Part 01 - Creating local User mailboxes - Link
- Hybrid Management - Part 02 - Creating local Exchange Shared Mailboxes - Link
- Hybrid Management - Part 03 - Creating local Exchange Room and Equipment Mailboxes - Link
- Hybrid Management - Part 04 - Configure the Hybrid Connection Wizard - Link
- Hybrid Management - Part 05 - Individual mailbox moves via the EAC - Link
- Hybrid Management - Part 06 - Bulk mailbox moves via the EAC - Link
- Hybrid Management - Part 07 - Moving bulk mailboxes with PowerShell - Link
- Hybrid Management - Part 08 - Creating Office 365 User Mailboxes via PowerShell - Link
- Hybrid Management - Part 09 - Creating Office 365 Shared Mailboxes via PowerShell - Link
- Hybrid Management - Part 10 - Creating Office 365 Room and Equipment Mailboxes via PowerShell - Link


Hybrid Management - Part 06 - Bulk mailbox moves via the EAC

In this tutorial we will migrate bulk mailboxes via the EAC. Moving bulk mailboxes is really quite simple to perform. As you can see below, we currently have 1 Cloud mailbox and 11 Local Exchange user mailboxes plus the Administrator mailbox (also Local Exchange).

In this tutorial, I will be moving two mailboxes, user.102 and user.103.
Before migration, set the region and assign a license to the two users that are being moved.

Set the region and assign licenses
Log into the Office 365 Admin Portal - Users - Active Users - Select the two users that are being migrated - Edit product licenses

In the Assign Products section -
Select - Add to existing product license assignments - Next

Edit the Location by clicking the Location drop down arrow and selecting the Country -

Next select the appropriate license and switch to On
Select the license options you would like -
Scroll down and click - Add - Close
You will now see that the four licenses have been applied.


Now the users have been licensed, we can move the bulk mailboxes to Office 365.

Preparation - Create and save a csv file of mailboxes to be moved.
---  The csv must be in the format - Link
Column Name - EmailAddress
Column entries - the email addresses

Moving the mailboxes

To move a multiple mailboxes from on-premises Exchange to Exchange Online -
--- Log into the Office 365 portal - Exchange Admin Console
Recipients - Migration -
+ - drop down -
Migrate to Exchange Online

The New Migration Batch window will open.

As this is a Hybid configuration, select Remote Move Migration - Next

In this instance we are going to use a csv file to indicate which mailboxes are being moved.

Select - Specify the users with a csv file - Choose file

Browse and select the file.

Migration Batch details will update with the csv file name and number of mailboxes in the csv
Next -

The Migration endpoint already exists as it was created in Part 05 - Link
The migration endpoint is usually the external FQDN of your on-premises Exchange.

Next -

Enter the Migration Batch Details as appropriate.
Enter a batch name - The batch name will automatically be the same as the csv file.
Select the Target delivery Domain -
Archive - Move the Archive (if exists)
Bad item limit - In the real world, set to zero to cause it to fail when a mailbox has bad items.
Large item limit
Next -

Set the migration batch starting parameters as required.
New -

The mailboxes will start to move (depending if you selected to Automatically Start)


Monitoring the moves

Monitor the moves on the Migration tab of the Recipients menu
Office 365 EAC - Recipients - Migration

To see details, select the batch name - and select 'View Details' on the right hand menu

Batch Details will be available.
You can view the progress of each of the mailbox moves.
You can select - 'Download the report for this user' to review the report

The status will change to Completed (if the batch was set to AutoComplete).
Congratulations - 
You have now successfully migrated a batch of mailboxes via the EAC.


Note -
Experience has shown me that the status will still show 'Completing' for a while after the mailboxes have actually moved.
To check if the mailboxes have moved, just click on Mailboxes 
( Office 365 ECP - Recipients - Mailboxes) and confirm
The image below (from another migration) shows that four mailboxes have moved, and two are still cutting over (completing).
Once cutover, all mailboxes will appear in the mailboxes tab.

Client cut-over experience

After cut-over, the client will need to login to the Office 365 portal to access email via the web.

If the client attempts to login to Exchange local OWA, they will receive a message advising them to click on the link that will take them to your Office 365 tenant login


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