Just ignore this, I wanted to store this code snippet somewhere and this was the best place. But if you are interested this will create a csv file from Get-MailboxStatistics, but with the TotalItemSize in MB
“DisplayName,TotalItemSize(MB),ItemCount,StorageLimitSize,Database,LegacyDN” | out-file GMS.csv; get-mailbox -resultsize unlimited | Get-MailboxStatistics | ForEach{$a = $_.DisplayName;$b=$_.TotalItemSize.Value.ToMB();$c=$_.itemcount;$d=$_.storagelimitstatus;$e=$_.database;$f=$_.legacydn;”$a,$b,$c,$d,$e,$f”} | out-file GMS.csv -Append