Create a Microsoft 365 user and assign a licence
Add a person in the admin centre or with Microsoft Graph PowerShell, set their usage location, and put a licence on the account so the mailbox actually works.
Microsoft 365 administration
Tenant tasks, written as runbooks.
Every guide here does one job in a Microsoft 365 tenant — adding a person, licensing them, standing up a shared mailbox — and does it twice: once in the admin centre, once in PowerShell, so you can pick the route that fits the day.
Start with the two jobs every tenant needs first
Create a shared mailbox in Exchange Online
A shared mailbox for the addresses a whole team answers — info@, frontdesk@, support@ — with members added and Full Access and Send As set properly.
How each runbook is laid out
Each runbook opens with what you need before you touch anything, walks the admin centre route as numbered steps, then gives the PowerShell route for the same end state. It closes with the checks that tell you the job is actually done — the user can sign in, the mailbox shows up in Outlook — and the snags that most often stop it halfway.
Browse the full list of runbooks.