New-Mailbox -Name 'First and Last Name' -Alias 'MailboxAlias' -OrganizationalUnit 'MyDomain/Users' -UserPrincipalName ' MailboxAlias@MyDomain' -SamAccountName 'MailboxAlias' -FirstName 'First Name' -Initials '' -LastName 'Last Name' -Password 'System.Security.SecureString' -ResetPasswordOnNextLogon $false -Database 'MyMailServer\First Storage Group\Mailbox Database'