Also, if you're planning to synchronize your on-premises Active Directory with Office 365, make sure you don't need to first update your user principal name (UPN). However, it can take up to 72 hours for a changed record to propagate through the DNS system.
If you’re having trouble adding DNS records, see Troubleshoot issues after changing your domain name or DNS records.
I add an exchange server and, I add an external record pointing to my server called mail.and it points to my external IP.
I ALSO want to be able to access my server using the internal IP instead of going through my firewall and back in.
Allow it to fix those – this may look like it’s paused for a few minutes, but it has not. The AV services you disabled – re-enable them and do one more reboot to confirm all is good and you are then clean and clear to move on.
Once the wizard has completed you should see the first two items come back to green ticks.
Now, in the background the system runs an update of the active directory schema.From here disable ANY antivirus software you have running on the system.Some AV software can interfere with the networking stack Second thing to do is to reboot into Directory Services Restore mode. Things will come up but you will not have AV protection.If you are using Root Hints, it may be necessary to update your root hints from time to time, as my good MVP friend, Mick, recently reminded me.And it’s fairly simple to do: First, you need to access a list of known root servers and note the IP address of one of them.One of the issues you will run into when migrating from an on premises Exchange 2010 server on SBS 2011 is that Outlook will not autodiscover the correct Office 365 server settings.