

Migration to Office 365 requires only proper Autodiscover and msoid records.Sometimes, source server local DNS may require adding A and SRV records for the target domain.Source server local DNS records should match public DNS records (for the target domain).Public DNS records must be properly configured for both source and target domain.For this to be possible, the following should be verified and amended, if necessary:


The bottom line is that you must be able to connect to the target server from within source server environment using target server's FQDN (check that by pinging the target server using its FQDN). There are many possible migration scenarios - see a description of some of them in CodeTwo Exchange Migration user's manual. Please review the whole article below before you start applying any changes. This is the case, for example, when you are migrating to a different forest with a different domain or to a different domain in the same forest but in different site. Please be aware that steps below are for cross-domain migration and assume both domains should be resolvable in public DNS records.

How to set up DNS records for a source and target domains, to make the cross-domain migration flawless. How to set up DNS records properly for a migration
