Considerations for Exchange 2010 when changing external domain name.
Posted on 2013-01-08
Exchange 2010 SP1
Single Site Domain/Organisation
HUB, MB and UM running on Server 2008
CAS running on Server 2008
We are, in the next few weeks, going to be changing our external domain name. The change will be distinct: ourcurrentdomain.co.uk -> ournewdomain.org. The change will not involve any changes to any servers or external IP addresses. We have configured our new DNS external zone with correct name to IP mappings. We will have to implement a new authoritative domain in Exchange 2010 as well as new email address policies for our clients to reflect the new domain in their SMTP addresses. Because my superiors want the old domain name to still be usable for a period of time TBD, we've altered our SAN cert by adding the new FQDNs for the new domain as well as making the new domain FQDN for CAS/OWA the CN of the cert whilst leaving all of the original FQDNs for the current (soon to be old) domain in. We are also aware that we will need to change the external URL for OWA in Exchange. Please note, we do not use autodiscover, nor do we have Outlook Anywhere enabled. My question is, after we've implemented these changes, will external users still be able to use https//mail.ourcurrentdomain.co.uk/owa to access OWA? It's not a deal breaker if they can't, but if there's a way to make it work, it would keep my bosses sweet.
Also, on the new cert, I've left the FQDN for Activsync set to the old domain name (since it's not really going anywhere) to avoid having a rush on the IT office from all our mobile users. If we leave the old URL in the Activsync settings in Exchange, will this work? Kind regards,