Can I combine these two arrays - arrays

Question

I have some simple Exchange Powershell I have written. I would like to list the UPN, Displayname, Item Count, and Item Size into a single CSV. However I have only been able to successfully push the data to two arrays and then manually combine them. Here is my code.
$MailBoxs = Get-Mailbox * | Select UserPrincipalName -ExpandProperty UserPrincipalName | Sort-Object UserPrincipalName
$Mailboxs2 = $MailBoxs.Where({ $_ -ne $null })
ForEach($MailBox2 in $MailBoxs2) { Get-MailboxStatistics $Mailbox2 | Sort-Object TotalItemSize –Descending | Select #{label=”User”;expression={$_.DisplayName}},#{label=”Total Size (MB)”;expression={$_.TotalItemSize.Value.ToMB()}},#{label=”Items”;expression={$_.ItemCount}} | Export-CSV "C:\T2\MailBoxSize.csv" -Append -NoTypeInformation }
ForEach($MailBox2 in $MailBoxs2) { $Mailbox2 | Export-CSV "C:\T2\MailBoxSize2.csv" -Append -NoTypeInformation }
Basically the second CSV gives me two fields for some reason the SMTP address and some random Length field, It also gives me a leading whitespace. If anyone has any ideas on how to clean this up I would love to hear them. Thanks for your time.

Answer 1

The multiple select statements were unnecessary. Here's a bit simplified way:
$mailboxes = #(Get-Mailbox *).
Where({$_.UserPrincipalName}) |
Sort-Object -Property UserPrincipalName
foreach ($box in $mailboxes) {
Get-MailboxStatistics $box.UserPrincipalName |
Sort-Object -Property TotalItemSize -Descending |
Select-Object -Property #(
#{L='UPN';E={$box.UserPrincipalName}}
#{L='User';E={$_.DisplayName}}
#{L='Total Size (MB)';E={$_.TotalItemSize.Value.ToMB()}}
#{L='Items';E={$_.ItemCount}}
) |
Export-Csv -Path 'C:\T2\MailBoxSize.csv' -NoTypeInformation -Append
}