As mentioned, a cut-over migration supports up to 2.000 user mailboxes, but it is possible to circumvent this limit by hiding users from the GAL or if you are dealing with a merger of multiple on-premises Active Directories to a single AAD/Office 365 tenant. The cut-over migration process itself includes provisioning of the users in the tenant. Enterprises with up to 2.000 mailbox users that for one reason or another wish to migrate from on-premise Exchange to Exchange Online using a cut-over migration.This is done by matching the cloud user identities with the respective on-premises Active Directory users using SMTP based soft matching. If you go through this scenario, you can later convert to one of the other identity models if required. Larger enterprises that want to try Exchange Online and other Office 365 workloads without needing to make significant changes in the on-premises Active Directory.Since the cloud identity model does not require any servers to be deployed on-premises, the enterprises can get up and running quickly. Small enterprises that do not already have an on-premises Active Directory. For this reason, this identity model is primarily targeted at: However, since the cloud identity model means that a new identity will be created for the end users, it also means the end users will be provided with a new set of credentials. Figure 3: Authentication for “Cloud Identities” model
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