Get-MailboxStatistics cmdlet changes between Exchange 2010 and Exchange 2013

Hi...

First of all, I am definitely not an expert in PowerShell, nor Exchange...

Based on bits an pieces I grabbed here and there on the Internet, I managed to create 2 distinct (but somewhat similar) powershell scripts to report on:

• the size of each Mailbox Store found on a given server
• the size of each Mailbox found on a given server

I am using the following cmdlets to pull the data I need:

Mailbox Store Size:

Get-MailboxStatistics -Server $MachineName `
  | where {$_.ObjectClass –eq “Mailbox”} `
  | Sort-Object Database `
  | Select-Object @{Name="Mailbox Store";expression={$_.Database}}, `
                  @{Name="Size (GB)";expression={$_.TotalItemSize.Value.ToGB()}} `
  | ConvertTo-CSV -OutVariable OutData -NoTypeInformation `
  | Select-Object -Skip 1 `
  | Out-File -FilePath $CsvFileToCreate -Encoding "unicode"

Mailbox Size:

Get-MailboxStatistics -Server $MachineName `
  | where {$_.ObjectClass –eq “Mailbox”} `
  | Sort-Object TotalItemSize –Descending `
  | Select-Object @{label="Mailbox Store";expression={$_.Database}}, `
                  @{label="User";expression={$_.DisplayName}}, `
                  @{label="Mailbox Size (MB)";expression={$_.TotalItemSize.Value.ToMB()}}, `
                  @{label="Total Items";expression={$_.ItemCount}} `
  | Export-CSV -Path $CsvFileToCreate -Encoding "unicode"

After that, I work with my CSV file to generate an nicely formatted report.

Until now this has worked well with Exchange 2007 and 2010...

But I recently came across 3 Exchange 2013 servers... and on each of these, the CSV produced file remains empty...

Any help will be appreciated.

Thanks

Francis Germain