For a new Microsoft 365 email subscription, start in the dashboard attached to your existing customer account. If you are adding a user to an established subscription, use its add-user workflow rather than creating a separate organisation.

Before setup

Have access to the purchased email product and the domain's authoritative DNS provider. List the people who need mailboxes. If another service receives your mail today, plan how to move messages, contacts and calendars before changing delivery.

Set up and verify

  1. Open your email product and use its setup action. Select the intended domain and create the required email users.
  2. Follow the product's domain verification and DNS instructions. Use the exact records shown for your account; records copied from another business will not be a reliable substitute.
  3. Prepare the destination mailboxes before changing MX records. Preserve the existing DNS configuration and review the cutover with your current mail provider when needed.
  4. Sign in to Outlook on the web with the new mailbox address and password. Complete the required identity and recovery setup.
  5. Test sending and receiving with an external account, then add the account to supported phone and desktop apps using the Microsoft 365 sign-in flow.

Before switching off the old service

Confirm delivery for every address, alias and other routing requirement. DNS changes do not copy historical mail. Retain the old account until the intended data migration and delivery checks are complete.

Reference and product help

Microsoft 365 setup series. If your account shows different controls, use the product help centre for your exact product.