I was looking for a way to get an overview of all servers in the domain regarding to Operating System and platform.
This is the first script in here using get-WMIOBJECT

Use WMI Explorer to find the properties you are looking for.

Again, if i can be of any help, just let me know.

Here's the script, it gives an idea how to use the get-wmiobject command in PS:

cls
$strPath="c:\xml\computers.xls"
$a = new-object -comobject excel.application
$a.Visible = $true
if (Test-Path $strPath)
{
# Open the document
$b = $a.WorkBooks.Open($strPath)
$c = $b.Worksheets.Item(1)
} else {
# Create It
$b = $a.Workbooks.Add()
$c = $b.Worksheets.Item(1)
#$c.Cells.Item(1,1) = "_Computername"
#$c.cells.item(1,2) = "_Operating System"
#$c.cells.item(1,3) = "_Harware model"
$d = $c.UsedRange
$d.Interior.ColorIndex = 19
$d.Font.ColorIndex = 11
$d.Font.Bold = $True
} 
$introw = $c.UsedRange.Rows.Count + 1
$computers = Get-QADComputer -OSName 'Windows*Server*'
foreach ($computer in $computers){
$name = $computer.name
$OS = $computer.operatingSystem
$uuu = $OS.Substring(0,14)
$ServerOS = Get-WmiObject Win32_OperatingSystem -ComputerName $computer.name
$Platform = Get-WmiObject Win32_ComputerSystem -ComputerName $computer.name
$SOS = $ServerOS.caption
$hw = $Platform.Model
if ($uuu -eq 'Windows Server') {
$introw = $introw  + 1
$c.cells.item($introw, 1) = $name
$c.cells.item($introw, 2) = $SOS
$c.cells.item($introw, 3) = $hw
}}
$objRange = $c.UsedRange
$objRange2 = $a.Range("A1")
[void] $objRange.Sort($objRange2)
$objRange.NumberFormat = "0#########"
$objRange.EntireColumn.AutoFit() |out-null