I want to list out Get-Mailbox | select userprincipalname | Get-MailboxStatistics | select TotalItemSize but it returned error.

"The input object cannot be bound to any parameters for the command either because the command does not take pipeline in
put or the input and its properties do not match any of the parameters that take pipeline input."

How can I get mailbox totalitemsize by email address?

I know you can pipe Get-Mailbox username | Get-MailboxStatistics..., so try Get-Mailbox | Get-MailboxStatistics... I suspect that by using Select-Object you're returning a property that Get-MailboxStatics can't do bind to any of its parameters.

• Proposed as answer by jrv 7 hours 25 minutes ago

Get-MailboxStatistics -Server sbs01|select DisplayName,TotalItemSize