What to know about a staged migration in Exchange Online

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You can migrate email, calendar and contact information from on-premises Exchange server to Exchange Online in many ways such as minimal hybrid method, cutover method, staged method, and so on. In this fifth part of a six-part series about migration from on-premises Exchange server to Exchange Online, we will discuss the staged method.

This method is recommended for migrating around 150 Exchange mailboxes (fromExchange Server versions 2003 and2007) over a course of few weeks. Staged migration also works like the other two types of migration but is not applicable for Exchange Servers versions above 2007.

For staged migration, you will have to perform tasks at three levels as a migration admin.

  1. On-premises Exchange server tasks:
    • Synchronize user profiles with Microsoft 365.
    • Create a CSV file with list of users to be migrated.
  2. Microsoft 365 tasks:
    • Check for domain connectivity.
    • Run a batch of migration (20 mailboxes at a time) using the migration dashboard in the Exchange admin center.
    • Verify directory synchronization.
    • Configure mail forwarding by editing the TargetAddressattribute.
    • Resolves issue if any and delete the migration batches.
  3. DNS-related tasks:
    • Create an auto-discover domain name system (DNS) record or MX record.
    • Check for proper routing.

M365 Manager Plus helps you to keep track of all types of migration with pre-defined and intuitive reports.

About M365 Manager Plus and migration statistics report

M365 Manager Plus is a comprehensive Microsoft 365 reporting, management, monitoring, auditing, and alerting tool. It provides reports on Exchange Server to Exchange Online migration statistics and users. Follow the steps given below to generate migration statistics report using M365 Manager Plus.

  1. Click on the Reports tab.
  2. Navigate to Exchange Online > Mailbox Reports > General Mailbox Reports.
  3. Choose the Migration Statistics report.
  4. Select the corresponding Microsoft 365 Tenant.
  5. Click on Generate Now.

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  • Report exporting: Reports can be exported to PDF, XLSX, HTML, or CSV formats and saved in the local computer for future reference.
  • Templates and automation: Helps manage Microsoft 365 objects like users, contacts and groups in bulk. Create templates for user provisioning and automating other Microsoft 365 tasks.
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