For a migration to be successful, there has to be a configured and functional Hybrid configuration between your source Exchange infrastructure and the Microsoft 365 tenant. We advise going through the following checklist to make sure these conditions are met.
- The process of creating a Microsoft 365 tenant and configuring the domain (Namespace) has finished
- Every Organizational Unit where Mailbox accounts that will be transferred exist is set up and configured to be a part of Azure AD Connect
- After successfully completing the Hybrid Configuration Wizard, the connectors' various settings have been set up. The Mail Flow Connectors/Federation and MRS Endpoints are included in this
- Depending on your selected cutover state, mail flow to the migrated account is operating effectively with an MX record pointing either into Exchange Online Protection or remaining On Premises
- The fact that Microsoft 365 users may access the MRS EndPoint indicates that a test of a single mailbox within the Microsoft 365 tenant has been successful
- You must enable Basic Authentication for both your source and your destination
More information on how to accomplish this is provided in the Prerequisites section below, along with links to the many Microsoft publications that make it easier.
There are a few conditions that must be finished in your environment before the migration. These requirements ensure that the system can connect and migrate successfully and have to do with the condition and setup of the Exchange and Office 365 tenant.
1. A legitimate domain and namespace have been set up, together with the Microsoft 365 tenant.
The appropriate domain name, which must coincide with the on-premises environment, should have been used when setting up the Microsoft 365 tenant. Depending on the sort of deployment you're carrying out, tenant configurations can differ significantly, but the fundamental setup should be compatible with the on-premises Exchange infrastructure you're leaving behind.
2. Identity synchronization between Azure AD Connect and the Microsoft 365 tenant is completed.
A crucial stage in the process is having legitimate identities inside the Microsoft 365 tenant because they serve as the connection between the on-premises and cloud-based implementations. Refer to the Microsoft article for more information on setting up and configuring the Azure AD Connect.
3. The Hybrid Configuration Wizard has been used and successfully finished its task.
Everything needed for setting up and configuring a hybrid environment is covered in this Microsoft article. You may access the whole list of requirements here.
4. MRS (Mailbox Replication Service) endpoint access is set up and operational.
The Hybrid Configuration Wizard step involves configuring the MRS endpoint. You can test it using the following methods after creating it and connecting to the Microsoft 365 Tenant PowerShell
Refer this link for guidance on how to connect to Exchange Online Powershell.
Execute the Test-MigrationAvailability cmdlet and enter the endpoint's configured version as the parameter.
Test-MigrationServerAvailability -Endpoint "Hybrid Migration Endpoint - EWS (Default Web Site)"
When a state fails, the Microsoft website's Hybrid Troubleshooting methods can help identify the problem.
5. With the help of the native toolset, a test migration involving just one mailbox was carried out successfully.
We suggest doing a single mailbox migration using a test or pilot mailbox, which can be manually run against the infrastructure, to ensure that everything is truly functioning exactly as planned. This verifies that the complete end-to-end hybrid environment is transferring data, looking up Free/Busy statuses, providing proper mail flow, and validating address book lookups.
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