$AdminUser = ""
$AdminOnPrem = ""
$PasswordFile = ("C:\ExchangeOnlineMigration\$adminuser.txt")

$password = get-content $passwordfile | convertto-securestring -ErrorAction Stop
$OnPremCred = new-object -typename System.Management.Automation.PSCredential -argumentlist $adminonprem,$password -ErrorAction Stop

$session = New-PSSession -ConnectionURI "https://ucfont02/OcsPowershell" -Credential $OnPremCred
Import-PsSession $session

$MAILBOXLIST = Import-CSV "C:\ExchangeOnlineMigration\Groupmembers.csv"
foreach ($line in $MAILBOXLIST) {
Disable-UMMailbox -Identity $line.EmailAddress -confirm:$false
}
Remove-PSSession $Session