08-04-2018 02:28 PM
08-04-2018 02:28 PM
We're going to be changing domains and as such, will need to change our Office 365 tenancy default domain (i.e. from company.com to new-company.com). We are doing 100% cloud hosted Office 365 (not hybrid with onsite domain controllers), so all apps are authenticating directly to Azure/Office 365.
I've added the new domain to our tenancy and configured all DNS entries properly so it's basically ready to go. The questions I have are:
1. If I make the change in Setup -> Domains to make newdomain.com my default, will that impact any of my currently configured Active Users? Or will their apps and accounts continue to function as normal until I explicitly set their account to use the new firstname.lastname@example.org as their default username/email? (*assume that I have already added the new email/username to their active account*)
2. After I manually change a user's username/email in Active Users to the new email@example.com, will their native desktop Outlook 2016 app (and the mobile Outlook app) automatically reconfigure themselves to use the new username, after the Active User logs in with their new firstname.lastname@example.org credentials? How long does it usually take between changing the Active User's username/email before Outlook detects that a change has occurred?
08-05-2018 02:33 AM
You can change the UPN using the following articles https://support.office.com/en-us/article/change-a-user-name-and-email-address-in-office-365-fb5ac074... and https://docs.microsoft.com/en-us/powershell/module/msonline/set-msoluserprincipalname?view=azureadps...
After you change the UPN the users will ask to login again using the new UPN, the time may differ depending the app, Outlook, Web, Activesync, etc.
11-19-2018 12:10 AM
1.) If you make domain changes just on the tenant, your users aren't impacted. If you change the UPN from the user, they will have changes.
2.) They have to re-login after the changes, and it will automatically get a new configuration. I can't tell you anything about the duration.