Office 365 Group to Office 365 Group Mailbox (Conversations) Migration Guide

Introduction

Note: Read the Office 365 Group to Office 365 Group Document Migration Guide for the instructions to migrate group files from one Office 365 tenant to another Office 365 tenant.

This migration guide contains the necessary steps to perform the actual migration, but there are many steps to preparing for migration. If this is your first time performing a migration, we have created a Migration Planning & Strategy Guide to walk you through planning, set-up, and general migration best practices.

To discover what items are moved with MigrationWiz in this scenario, and which items will not be moved, see Moved Items. Note that these items will vary by source and destination, so check the proper environment listings carefully.

MigrationWiz is a migration tool, not a syncing tool. If changes are made at the source after migration, they will not sync to the destination, nor will changes made at the destination sync to the source. We do not have “live” monitoring of changes (as with a sync agent) and we cannot handle scenarios such as conflict resolution without user interaction.


Important:

  • Some group conversations might not be nested at the Destination.
  • The group OneNote notebook is not migrated.
  • We are not able to support migrations with two-factor or multifactor authentication. 

 

Prepare the Source Environment

  1. Create an administrator account in Office 365 to be used for the migration, or use the global admin account for the tenant. For more information see How do I create an administrator account in Office 365, and then use this during migration?
  2. Add the migration administrator account as an owner and a member of the Source group. Read the Manage Group membership in the Office 365 admin center article from Microsoft to learn more.
  3. Make note of the owners and members of the group. You will need this information later when replicating the membership of the Source group at the Destination group.

 

Prepare the Destination Environment

  1. Create an administrator account in Office 365 to be used for the migration, or use the global admin account for the tenant. For more information see How do I create an administrator account in Office 365, and then use this during migration?
  2. Create the Office 365 Group, if it doesn't already exist. Read the Create and navigate a group article from Microsoft to learn more.
  3. Add the migration administrator account as an owner and a member of the Destination group. Read the Manage Group membership in the Office 365 admin center article from Microsoft to learn more.
  4. Add other owners and members to the group to replicate the membership of the Source group.

 

MSPComplete Steps

  1. Create the customer. For more information see View, Add, and Edit Your Customers
  2. Create the Source and Destination endpoints. For more information see View, Add, and Edit Customer Endpoints
    • For the Source endpoint:
      • Click Endpoints > click Add Endpoint > enter endpoint name > select Office 365 Groups for endpoint type. 
      • For the URL field, enter the tenant's SharePoint top-level site URL.
      • Enter the admin account credentials.
        Note: This should be a global admin account. If creating a separate admin account for the purpose of migration, refer to the Office 365 section in How do I create an administrator account for login?.
    • For the Destination endpoint:
      • Click Endpoints > click Add Endpoint > enter endpoint name > select Office 365 Groups for endpoint type. (NOTE: If your endpoint is GCC High, select Office 365 (US Government) for your endpoint)
      • For the URL field, enter the tenant's SharePoint top-level site URL.
      • Enter the admin account credentials.
        Note: This should be a global admin account. If creating a separate admin account for the purpose of migration, refer to the Office 365 section in How do I create an administrator account for login?.
  3. Purchase User Migration Bundle licenses. User Migration Bundle licenses allow multiple types of migrations to be performed with a single license. They also allow DeploymentPro to be used to configure Outlook email profiles. Refer to these articles for more information:

MigrationWiz Steps

  1. Create the mailbox migration project. Read the How do I create a new migration project? article for more information.
  2. Add the Source and Destination group email addresses. For more information see How do I add items to my migration project?
  3. Apply User Migration Bundle licenses to all email addresses in the migration project.  For specific steps see Applying User Migration Bundle licenses in MigrationWiz.
  4. Set the project Advanced Options. For more information see What project Advanced Options are available?
    • Under Filter Folders add the following:  ^(?!Inbox$)
      • This RegEx expression only migrates the Inbox, but not its subfolders. To migrate both the Inbox folder and Calendars folder, use instead the RegEx expression ^(?!Inbox$|Calendar$). These filters are used to prevent failures, as Groups should only contain an Inbox folder, and possibly a Calendar.  No other folders are supported. Note that this expression must be in the source language, such as ^(?!Boîte de réception$) for French.
    • "Use Impersonation to authenticate" must not be checked in the advanced options for the source or destination the migration will fail.
    • Under Support/Support Options add:  RecipientMapping="@old-domain.com->@new-domain.com" 
      • replace "old-domain.com" and "new-domain.com" with your actual domain names
      • This performs a find and replace that updates email addresses from one domain name to another. Use this support option when migrating mailboxes from an old domain name to a new domain name. For more information see How do I add Recipient Mappings to a project?  
  5. Run verify credentials. For more information see How do I verify credentials?
  6. Notify users that a migration is occurring. Send an email to all users telling them the time and date of the migration.
  7. Perform a full migration pass. For more information see How do I start a migration?
    Important Note: Under the Select what to migrate section, ensure that only Mail is selected before starting the migration. You may also select calendars. 
  8. Click the bar chart icon in the MigrationWiz dashboard to receive an email containing all the project migration statistics. For more information see How do I request statistics for my migration project?

 

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