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For Exchange servers 2003 and later, cutover migration is recommended especially if you would like for the migration to span a couple of days as opposed to a longer time frame. A cutover migration is a process which must be completed in one go. Microsoft emphasizes that, although this method enables to migrate up to 2000 mailboxes, it is recommended not to exceed 150. This way, admins can ensure better stability and reduce the risk of many undesired errors.
This checklist shows how to perform a cutover migration.
As for post-migration tasks, an Autodiscover record has to be created in DNS. It is necessary for users to connect easily to respective Office 365 mailboxes. More on creating DNS records in Office 365 here.
At this stage, it might be a good idea to verify if the Autodiscover service is working. If everything went well, the on-premises Exchange can be removed from your server.
For more information on the cutover migration process, consult this Microsoft Support article.
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