Hi,
we are currently utilizing a third party exchange 2013 cloud service to host user's mailboxes ( intermedia), now we implemented an exchange 2013 on-premises environment in Hyper V infrastructure and want to plan migration of mailboxes and related configuration. cloud and on-premises environment have same SMTP domain ( Eg: XYZ.ORG) and currently an additional Temporary SMTP domain ( XYZ.CO ) used to test the external mailflow of on-premises since xyz.org is registered with cloud.
we need to migrate all mailboxes to on premises and enable XYZ.ORG for on-premises.
Pls suggest the prerequisites,steps, best practices for migration
Thanks in advance.