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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...
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