RE: migrating to office 365 from Microsoft outlook

Hi Pius,

Yes, you can use the same email id (such as xyz@laithllc.com) in Office 365. To do this, you need to first add your custom domain (laithllc.com) in Office 365. For more detailed information, here is an article for your reference: https://support.office.com/en-us/article/Verify-your-domain-and-change-name-servers-at-any-domain-registrar-a8b487a9-2a45-4581-9dc4-5d28a47010a2?ui=en-US&rs=en-US&ad=US

In fact, the “onmicrosoft.com” domain is the initial domain when you create an Office 365 tenant. But users can choose to use their custom domain.

Anything is not clear, or you encounter any further problems, just feel free to post back. We’re always here to assist you.

Thanks,
Richard