How to Migrate O365 to Another Tenant Easily?

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mithileshtata

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Moving Microsoft O365 data between tenants using the Aryson Tenant to Tenant Migration Tool is a streamlined process compared to manual PowerShell migrations. Here is the condensed guide for performing the export and migration.

1. Prerequisites & Setup​

Before launching the tool, ensure the following are ready:
  • Global Admin Credentials: You need admin access for both the Source and Destination tenants.
  • Azure App Registration: You must register an application in the Azure Portal (Microsoft Entra ID) to generate a Client ID and Tenant ID for both sides.
  • Impersonation Rights: Ensure the admin account has the necessary permissions to access all user mailboxes.

2. Migration Steps​

Phase 1: Source Connection​

  1. Launch the Aryson Microsoft 365 Tenant to Tenant Migration Tool.
  2. Select Office 365 as the source and click Login.
  3. Enter the Source Global Admin credentials and the Application ID/Tenant ID.
  4. The tool will fetch and display all mailboxes, groups, and sites. Select the items you wish to migrate.

Phase 2: Destination Connection​

  1. Click Next and choose Office 365 as the destination.
  2. Enter the Destination Global Admin credentials and the corresponding App registration details.
  3. The tool will establish a secure connection to the new tenant.

Phase 3: Mapping & Filtering​

  1. Mailbox Mapping: Map the source mailboxes to the destination mailboxes (e.g., user@source.com → user@destination.com). You can do this manually or via a CSV file.
  2. Select Categories: Choose specific data to export: Mail, Calendar, Contacts, OneDrive, or Teams.
  3. Apply Filters: Use the Date Range filter to migrate only recent data or use the Task Filter to exclude specific folders (like Trash or Spam).

Phase 4: Execution​

  1. Click the Convert or Migrate button.
  2. Monitor the live progress bar for each mailbox.
  3. Once finished, download the Log Report to verify that all items were successfully exported to the new tenant.

3. Critical Post-Migration Tips​

  • DNS Records: Update your MX, SPF, and DKIM records to point to the new tenant to ensure mail flow continues.
  • Outlook Profiles: Users will need to create new Outlook profiles as the backend server ID has changed.
  • License Check: Ensure destination users have active O365 licenses assigned before the data arrives, or the migration may fail.
You can get solution from here also: https://marketplace.microsoft.com/e...26.office-365-tenant-to-tenant-migration-tool
 
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