Hi,
The company i work for is currently in the process of migrating our regions of users from Exchange on Prem (a mix of 2007 and 2013).
One of the questions asked was if we were able to upload additional UPN suffixes that didn't match our DNS Domain name for our AD Forest and Child Domains, but were being used as primarySMTP addresses for some users. This to assist with the logon experience for users being the same for everyone.
Currently we do not have additional UPN Suffixes added into our Production AD Forest. The reasons for this I do not know.
The people who would have had this historical knowledge are no longer with the company, so I'm trying to identify any technical reason or impact as to why I WOULD NOT add these additional UPN Suffixes to our forest?
For the most part, I cannot see issues other than applications that would only be able to utilise a DNS Domain name of one of our child/forest default UPN Suffixes.
Does anyone else have any other insight as to why this should not be done?
Hopefully I have clarified the issue well enough. Happy to give more detail if required.
Thanks in advance.
Simon