office 365 exchange online email address alias

user xyz recently married.  If I understand correctly, I edit her email address, create alias with married name, set married name alias as primary which will make original name secondary.  All mail whether old name or married name will arrive in the one mailbox.  I edit Display Name to married name.
When creating new email, replying, or forwarding it will show from married name and married name email address.
I reconfigure outlook to login as new married name email address.
EXAMPLE  - current email address xzy@abc.com, add alias xyzmarried@abc.com, make xyzmarried@abc.com primary, configure outlook to logon using xyzmarried@abc.com
She wants to keep old and new email addresses indefinitely and not have to pay for an additional license
yel69p51Asked:
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Vasil Michev (MVP)Commented:
That's pretty much it, yes. The only thing I can add - the login name and the primary SMTP address *can* be different. If you dont change the UPN (login name), she will have to use the old one every time Outlook (or any other app) asks for credentials.
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yel69p51Author Commented:
Thanks for the info on SMTP primary can be different.  I will proceed as planned.  Thanks
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