Monitor - Large Outlook Files

# Monitor Large Outlook Files
Import-Module $env:SyncroModule -DisableNameChecking

$LargeFileSize = '45' # In gigabytes (Outlook default maximum size is 50GB, can be changed via registry)

# Sanitize and convert input to bytes
$LargeFileSize = [int64]$LargeFileSize.Replace('GB', '') * 1GB

# Get Outlook files from all user profile folders
$OutlookFiles = @(Get-ItemProperty "$env:SystemDrive\Users\*\AppData\Local\Microsoft\Outlook\*.ost")
$OutlookFiles += Get-ItemProperty "$env:SystemDrive\Users\*\AppData\Local\Microsoft\Outlook\*.pst"
$OutlookFiles += Get-ItemProperty "$env:SystemDrive\Users\*\Documents\Outlook Files\*.pst"

# Look for large Outlook files and output in our preferred format
$LargeOutlookFiles = foreach ($OutlookFile in $OutlookFiles) {
    if ($OutlookFile.Length -gt $LargeFileSize) {
        [PSCustomObject] @{
            'Filename'      = -join $OutlookFile.Name[0..65] # Trim to keep table formatting
            'Size in GB'    = [math]::Round(($OutlookFile.Length / 1GB), 2) # Convert to GB with 2 decimal places
            'Last Modified' = $OutlookFile.LastWriteTime
        }
    }
}

if ($LargeOutlookFiles) {
    $LargeOutlookFiles = $LargeOutlookFiles | Out-String
    $LargeOutlookFiles
    Rmm-Alert -Category 'Outlook' -Body "Large Outlook Files Found: $LargeOutlookFiles"
} else {
    "No large Outlook files found."
    Close-Rmm-Alert -Category 'Outlook'
}