Back-end tasks Other back-end tasks that are running during migration time. Because it's a best practice to perform migration after business hours, it's common that migrations conflict with other maintenance tasks running on your on-premises servers, such as data backup. Review other system tasks that might be running during migration.
We recommend that you perform data migration when no other resource-intensive tasks are running. Note : For customers using on-premises Microsoft Exchange, the common back-end tasks are backup solutions and Exchange store maintenance. This is often overlooked, and customers use a low-scale virtual machine to act as the hybrid server. This results in poor migration performance. In addition to the applying the best practices previously described, we've tested the following best practices which resulted in improved migration performance in real customer migrations:.
Hybrid deployment migration uses native Microsoft and Office tools. It's subject to Microsoft and Office migration service throttling.
There is a key difference for the end-user experience when the migration is from Exchange Unlike later versions of Exchange, Exchange end users cannot access their mailboxes when their data is being migrated.
Therefore, Exchange customers are usually more concerned about when to schedule migrations and the time required to migrate, especially when migration performance is low because of large mailbox sizes or a slow network. Exchange migration is also very sensitive to interruptions. For example, in a real customer migration, during the migration of a 10GB mailbox, a service incident occurred when the migration of the mailbox was 50 percent complete.
The Office client access server, which was processing the data migration, had to be restarted to resolve the issue. Upgrade : When you upgrade from an earlier version of Exchange, you move mailboxes from the existing Exchange servers to an Exchange Mailbox server.
Realignment : For example, you might want to move a mailbox to a database that has a larger mailbox size limit. Investigate an issue : If you need to investigate an issue with a mailbox, you can move that mailbox to a different server. For example, you can move all mailboxes that have high activity to another server.
Corrupted mailboxes : If you encounter corrupted mailboxes, you can move the mailboxes to a different server or database. The corrupted messages won't be moved. Physical location changes : You can move mailboxes to a server in a different Active Directory site.
For example, if a user moves to a different physical location, you can move that user's mailbox to a server closer to the new location. Separation of administrative roles : You might want to separate Exchange administration from Active Directory user account administration. To do this, you can move mailboxes from a single forest into a resource forest scenario.
In this scenario, the Exchange mailboxes reside in one forest and their associated Active Directory user accounts reside in a different forest. Outsourced email administration : You might want to outsource the administration of email and retain the administration of Active Directory user accounts.
If you use the EAC to move mailboxes, cross-forest moves and onboarding remote move migrations are pull move types because the request is initiated from the target environment. Offboarding remote move migrations are a push move type because the request is initiated from the source environment. You need to be assigned permissions before you can perform this procedure or procedures.
To see what permissions you need, see the "Exchange Web Services permissions" section in the Clients and mobile devices permissions topic.
If you've deployed more than one Client Access server in your Exchange organization, you should enable the MRS Proxy endpoint on each one. Cross-forest moves and remote move migrations can fail if the MRS Proxy endpoint isn't enabled on all Client Access servers. If you don't perform cross-forest moves or remote move migrations, keep MRS Proxy endpoints disabled to reduce the attack surface of your organization. For information about keyboard shortcuts that may apply to the procedures in this topic, see Keyboard shortcuts in the Exchange admin center.
Once complete, this should show as a secondary address with a lower-case smtp type :. With our Hybrid Configuration in place, we will begin by testing migrations to Office before actually migrating real users. The purpose of performing test migrations is to ensure that everything works well, once we move mailboxes.
Even with good connectivity in place, the correct firewall rules configured and Office clients installed, things can still go wrong. This allows Remote Moves. The New Migration Batch wizard should appear. On the next page of the wizard, we should see the Migration Endpoint pre-populated.
This will have a GUID string, followed by. This corresponds to the endpoint managed by the Hybrid Agent. The target delivery domain is the Office tenant domain, as set in our Email Address Policies and used for routing email from on-premises to migrated mailboxes. If the domain in the format tenantname. The new migration batch should be created, and show in the Migration tab of the Exchange Admin Center.
As it begins, the status should change to Syncing. You can monitor the progress of all mailboxes within the batch by choosing the View details link:. By choosing View details we will see the status for individual mailboxes as they synchronize. For our test mailboxes in the batch below, we can select a mailbox and view progress, and if needed download a report detailing any errors or issues during the sync:.
After all mailboxes in the batch have performed an initial sync, the status will change to Synced. Approximately every 24 hours, an additional sync will be performed to ensure content is up to date. At this stage, users will not see any changes as the sync has happened in the background.
When we are ready to switch over users within the migration batch, select the Complete this migration batch link:. Within approximately 30 minutes for most batches the final synchronization and switch should occur. You can perform basis email flow tests using Outlook on the web.
Send emails from on-premises and the migrated mailboxes to test basic mail flow:. To ensure secure mail flow is in place, set Out of Office replies for Internal recipients for the test mailboxes both on-premises and in Office By validating that an Internet OOF reply is sent rather than an external one we check that the correct secured connectors are being used to send and receive mail between the two environments.
Next, ensure that the test mailboxes have existing meetings scheduled. Then, attempt to schedule a meeting from an Office user checking the availability using the Scheduling Assistant of an on-premises user that has existing appointments. If this succeeds, connectivity via the Hybrid Agent is working as expected:.
Perform the same test from on-premises, this time checking the availability of the migrated Office account. In addition to the service tests, ensure you test clients that represent your environment. Recommended client tests include:.
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