When working with installation systems or other Network systems
you often need your users MAC Address.
You can ask the users to start cmd.exe and then do a ipconfig.exe /all.
If you have 100-5000 users this can be a whole year of work 
Or you can open up powershell and use this little script:
$strComputer = "."
$colItems = get-wmiobject -class "Win32_NetworkAdapterConfiguration" -computername $strComputer |Where{$_.IpEnabled -Match "True"}
foreach ($objItem in $colItems) {
$objItem |select Description,MACAddress
}
Combine this script with a Active Directory script that will show all of your
computers and then Export it to a csv file and you have a good import file!
No related posts.
New blog post about getting MAC Addresses from remote computers, http://tinyurl.com/nqo8j9
Here’s another way using server side query:
Get-WMIObject Win32_NetworkAdapterConfiguration -computerName $strComputer -filter “IPEnabled=’True’” | select __SERVER,Description,MACAddress