#Description / Function
# This script will change the Home Folder (Connect:) in the AD User properties
# Used for migration, this script will check the existing path to see if it contains the old file server ($source)
# If old file server is found, it will rename to new file server ($destination)
# eg. \\5555FS03\Staff$\08123456 to \\5555FS01\Staff$\08123456
#Note - This script will ONLY replace part of a string. eg. 5555FS01 to 5555FS03
#and leaves everything else in-tact.

Import-Module ActiveDirectory

# EDIT BELOW #
$OU = "OU=test,OU=Staff,OU=Users,OU=ABC,DC=internal,DC=domain-name,DC=wan"
$source = "5555FS03"
$destination = "5555FS01"
# EDIT ABOVE #

$users = Get-ADUser -Filter * -Properties HomeDirectory -SearchBase $OU

foreach($user in $users) {

    $oldDir = $user.HomeDirectory
    $newDir = $user.HomeDirectory -replace [Regex]::Escape("$source"), "$destination"
    Set-ADUser $user -HomeDirectory $newDir

    if($oldDir -Ne $newDir) {
        Write-Host $user.Name
        Write-Host "OldDir: $oldDir"
        Write-Host "NewDir: $newDir"
        Write-Host ""
    } else {
        Write-Host $user.Name + ": Nothing to do"
           }
}