Mass Message

This script will look through AD and send a message to all Computers that match a wildcard name, IE entering admin will match with admin-55, site1-admin, site1-amdin-11 etc.
OR it will go through an OU Given by Search Base

It will then display the message for the set time (MS) set to 600 by default.

Notes

Example output of the message shown.
image image

The Script itself

MassMessage.ps1

$ComputerName = read-host "Enter Computer name Do not include * For wild cards. it is added Automatically"
$Computers = Get-ADComputer -Filter "Name -like '*$ComputerName*'" | select-object -ExpandProperty name ##Gets all all Computers with a host name entered above
##Comment out the two lines above and uncomment the one bellow if you prefer to do it based on OU 
#$Computers = Get-ADComputer -SearchBase "OU=YOUROUHERE,DC=DOMAIN,DC=TLD" -Filter * | select-object -ExpandProperty name
$msg = read-host "Please enter your message" #Enter The Message you want it to be 
ForEach ($Computer in $Computers) {
    if (test-Connection $Computer -Count 1 -Quiet ) { 
    Write-Host "Sending $msg to $Computer"
    Invoke-WmiMethod `
        -Path Win32_Process `
        -Name Create `
        -ArgumentList "msg * /time:600 $msg" `
        -ComputerName $Computer
}
}