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Help Center Home Power365 Platform Tenant-to-Tenant Directory Sync Migration for Active Directory Support


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Additional Information  


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Basic Migration


Mailbox Licenses

  • For mailbox data migrations, only Exchange Online Licenses that allow MAPI/HTTP are supported.

IMPORTANT: During a mailbox migration, the source and target user accounts will be licensed in Office365 to provide a mailbox to migrate data into. This means your organization will be consuming two Exchange licenses; one in the source tenant, and one in the target tenant for the duration of the mailbox migration. Once the mailbox migration is complete, the source license can be recovered. Please plan appropriately.


Target Mailboxes

  • Target Mailboxes must be provisioned in the target Microsoft 365 multi-tenant prior to data migration.


Test Mailbox Accounts

  • As a best practice, we suggest at least 5 populated source Mailboxes for migration testing & validation purposes. Include some sample email messages, some contacts, and some calendar entries.


Source & Target Mailbox Delegation

  • The required service account must be granted the Full Access permission to their respective tenant mailboxes to allow a delegate to open the mailbox and behave as the mailbox owner. This will be automatically executed by the Power365 systems during the first synchronization.
  • The ApplicationImpersonation role is required for the Global Admin to allow hidden email messages used by the system to be sent.


Source & Target User Mappings  

  • You will need create and upload a spreadsheet of all source users (in scope for migration) matched to all target users using the UPN (UserPrincipalName).

This spreadsheet has four columns, the source UPN, the target UPN, and, optionally, but recommended, the migration wave and profile name columns. A migration wave is a way to group many mailboxes into smaller collections so you take administrative actions against them instead of all users. Profiles are used to select the type and date ranges of data to be migrated. During the configuration, we will provide a template that you can download.


On-Premises Migration

Power365 offers migration to/from on-premise Exchange environments with the following additional requirements:

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