Microsoft Office Tutorials and References
In Depth Information
If your organization has Exchange 2010 or 2013 with more than 1,000 mailboxes, you will
need to implement an Exchange hybrid deployment, which is what you implemented in
Figure 12-1 shows a flowchart depicting migration options available to your organization
based on your on-premises configuration.
Figure 12-1 Migration options.
A cutover migration is ideal for organizations with 1,000 mailboxes or less. The other
important requirement for a cutover migration is that directory synchronization has not
been established. The reason for this is because the cutover migration will create users in
Office 365 as part of the process. Therefore, if directory synchronization is already
synchronizing Active Directory (AD) objects to Office 365, you need to use a staged migration or
migrate using a hybrid deployment.