This little script crawls a file share and adds the file size for GroupWise Archives. I split the name out from the path, but that's unique to my environment. The last bit converts the number to a readable format, and groups duplicate entries.

Get-GWArchive.ps1

$tSize = 0
Get-ChildItem -Path \\personal\users\ -Directory -Filter "of*arc" -Exclude '* *' -Recurse | % {
    $pSize = 0
    Get-ChildItem $_.FullName -File -Recurse | % {
        $pSize += $_.Length
        $tSize += $_.Length
    }
    $pProps = New-Object psobject -Property @{
    'user'=$(($_.FullName -split '\\')[4]);
    'size'=$($pSize)
    }
    $pProps | select user,size | Export-Csv -Append -NoTypeInformation -Path C:\PSResults\groupwise-arch.csv
}

$tProps = New-Object psobject -Property @{
    'user'="total";
    'size'=$tSize
}
$tProps | select user,size | Export-Csv -Append -NoTypeInformation -Path C:\PSResults\groupwise-arch.csv

function Format-HumanReadable 
{
    param ($size)
    switch ($size) 
    {
        {$_ -ge 1PB}{"{0:#.###'P'}" -f ($size / 1PB); break}
        {$_ -ge 1TB}{"{0:#.###'T'}" -f ($size / 1TB); break}
        {$_ -ge 1GB}{"{0:#.###'G'}" -f ($size / 1GB); break}
        {$_ -ge 1MB}{"{0:#.##'M'}" -f ($size / 1MB); break}
        {$_ -ge 1KB}{"{0:##'K'}" -f ($size / 1KB); break}
        default {"{0}" -f ($size) + "B"}
    }
}

$csv = Import-Csv C:\PSResults\groupwise-arch.csv | Group-Object -Property user

[array]$newCsv += foreach ($i in $csv) { $i.Group | select -Unique user,@{n='size';e={(($i.group) | measure -Property size -Sum).sum}} }

$newCsv | % { $_.size = Format-HumanReadable($_.size) }

$newCsv | Export-Csv -NoTypeInformation -Path C:\PSResults\groupwise-arch-totals.csv