Mastering Office 365 Administration

Creating a user mailbox

You can't create a user mailbox in Exchange Online; to do that with the web browser, you'd need to do it in the Office administration portal. But you can do it with PowerShell with the New-Mailbox cmdlet:

$password = Read-Host "Enter password" -AsSecureStringNew-Mailbox -Alias alara -Name alara.rogers -FirstName Alara -LastName Rogers -DisplayName "Alara Rogers" -MicrosoftOnlineServicesID [e-mail] -Password $password -ResetPasswordOnNextLogon $true

This creates a mailbox for the user, but you'll need to assign a license in the administration center, or the mailbox will be disabled after the grace period.

For more parameters for New-Mailbox, read https://technet.microsoft.com/en-us/library/aa997663(v=exchg.160).aspx ...