Is there an Exchange best practices for changing a company domain name?

We've been doing tech support for a medical suppy company for several years.  They have decided to rebrand themselves and have obtained a new domain name.  They have around 30 user licenses (some are Enterprise E3 licenses with software some are just plain Exchange.)  

What is the correct way to move them into this new domain?  For one thing, many licenses are paid up for the year.  Also, is there anyway to provide continuity from the old email addresses to the new?  Or must we just export all their present accounts to PST files and simply attach them to the new Outlook profiles as archived data files?

Any advice would be appreciated!
Kevin DrewTechnicianAsked:
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RoninCommented:
More clarification needed.
So some users deployed in Office365 and some users on-prem Exchange? Do you have Hybrid connectivity in-place? Do you use AADConnect to sync users between on-prem and Office365?
If only rebrand that is required is the domain name, depends on your config it's easy to do.
MaheshArchitectCommented:
no need to move / migrate outlook profiles
simply register new domain with existing O365 tenant and add new email address pointing to new domain and make it primary
Old email address will remain AS IS, so that they can receive emails on both email address
Now whatever emails send by them will be pass through new email address and will receive communication as well on new address provided that you register new domain MX record
Later on you can inform everybody about new email address and deprecation of old email address

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Kevin DrewTechnicianAuthor Commented:
Thanks! That's great news.  I'll get on this right away and add another comment when it's finished.
Kevin DrewTechnicianAuthor Commented:
The answer was correct.  I had only to follow the same procedure for adding a domain to the account that I had done originally.  Then you go to each user and add their username with new domain (which is available in a drop down box) as an alias.  When ready, you can then go to each user and mark the new user/domain alias as the default for the account.  Now I just have to figure out how to get their Outlook sending from the new domain (it receives with no problem.)
Kevin DrewTechnicianAuthor Commented:
The answer was correct.  I had only to follow the same procedure for adding a domain to the account that I had done originally.  Then you go to each user and add their username with new domain (which is available in a drop down box) as an alias.  When ready, you can then go to each user and mark the new user/domain alias as the default for the account.  Now I just have to figure out how to get their Outlook sending from the new domain (it receives with no problem.)
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