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onmicrosoft.com accounts
Hi, looking to understand more about the onmicrosoft.com domain in O365 tenants, which I've seen some info https://support.office.com/en-us/article/About-your-initial-onmicrosoft-com-domain-in-Office...
- The .onmicrosoft.com users were either created before you synced your domain or created manually in O365. You can switch their UPN to be your corporate domain instead of .onmicrosoft.com and users should then be able to login with their corporate credentials (assuming you are doing some form of AD Connect or Sync). The one limitation as far as I know is that after switching the UPN suffix their profile properties won't sync fully since the pre-existing properties will be preserved. At least that is what I've seen in practice.
a lot of companys start with Onmicrosoft.com accounts and after they add the domain they change it. you should check if you did not add aliasses to the onmicrosoft.com accounts before deleteing. In another case they use the Onmicrosoft.com accounts for admin accounts so it is clear who is a admin. kr, Paul