#script begin
" "
write-host "***********************************************"
write-host "   Security & Compliance Center PowerShell  " -foregroundColor yellow -backgroundcolor darkgreen
write-host "   Core eDiscovery cases - Add users to a hold   " -foregroundColor yellow -backgroundcolor darkgreen 
write-host "***********************************************"
" "
# Connect to SCC PowerShell using modern authentication
if (!$SccSession)
{
  Import-Module ExchangeOnlineManagement
  Connect-IPPSSession
}

# Get other required information
do{
$casename = Read-Host "Enter the name of the case"
$caseexists = (get-compliancecase -identity "$casename" -erroraction SilentlyContinue).isvalid
if($caseexists -ne 'True')
{""
write-host "A case named '$casename' doesn't exist. Please specify the name of an existing case, or create a new case and then re-run the script." -foregroundColor Yellow
""}
}While($caseexists -ne 'True')
""
do{
$holdName = Read-Host "Enter the name of the new hold"
$holdexists=(get-caseholdpolicy -identity "$holdname" -case "$casename" -erroraction SilentlyContinue).isvalid
if($holdexists -eq 'True')
{""
write-host "A hold named '$holdname' already exists. Please specify a new hold name." -foregroundColor Yellow
""}
}While($holdexists -eq 'True')
""
$holdQuery = Read-Host "Enter a search query to create a query-based hold, or press Enter to hold all content"
""
$holdstatus = read-host "Do you want the hold enabled after it's created? (Yes/No)"
do{
""
$inputfile = read-host "Enter the name of the text file that contains the email addresses of the users to add to the hold"
""
$fileexists = test-path -path $inputfile
if($fileexists -ne 'True'){write-host "$inputfile doesn't exist. Please enter a valid file name." -foregroundcolor Yellow}
}while($fileexists -ne 'True')
#Import the list of addresses from the txt file.  Trim any excess spaces and make sure all addresses 
    #in the list are unique.
  [array]$emailAddresses = Get-Content $inputfile -ErrorAction SilentlyContinue | where {$_.trim() -ne ""}  | foreach{ $_.Trim() }
  [int]$dupl = $emailAddresses.count
  [array]$emailAddresses = $emailAddresses | select-object -unique
  $dupl -= $emailAddresses.count
#Validate email addresses so the hold creation does not run in to an error.
if($emailaddresses.count -gt 0){
write-host ($emailAddresses).count "addresses were found in the text file. There were $dupl duplicate entries in the file." -foregroundColor Yellow
""
Write-host "Validating the email addresses. Please wait..." -foregroundColor Yellow
""
$finallist =@()
foreach($emailAddress in $emailAddresses)
{
if((get-recipient $emailaddress -erroraction SilentlyContinue).isvalid -eq 'True')
{$finallist += $emailaddress}
else {"Unable to find the user $emailaddress"
[array]$excludedlist += $emailaddress}
}
""
if($finallist.count -gt 0)
{
""
Write-Host "Creating the hold named $holdname. Please wait..." -foregroundColor Yellow
if(($holdstatus -eq "Y") -or ($holdstatus -eq  "y") -or ($holdstatus -eq "yes") -or ($holdstatus -eq "YES")){
New-CaseHoldPolicy -Name "$holdName" -Case "$casename" -ExchangeLocation $finallist -Enabled $True | out-null
New-CaseHoldRule -Name "$holdName" -Policy "$holdname" -ContentMatchQuery $holdQuery | out-null
}
else{
New-CaseHoldPolicy -Name "$holdName" -Case "$casename" -ExchangeLocation $finallist -Enabled $false | out-null
New-CaseHoldRule -Name "$holdName" -Policy "$holdname" -ContentMatchQuery $holdQuery -disabled $false | out-null
}
""
}
#write log files (if needed)
$newhold=Get-CaseHoldPolicy -Identity "$holdname" -Case "$casename" -erroraction SilentlyContinue
$newholdrule=Get-CaseHoldRule -Identity "$holdName" -erroraction SilentlyContinue
if(($finallist.count -gt 0) -or ($excludedlist.count -gt 0) -or ($newhold.isvalid -eq 'True') -or ($newholdrule.isvalid -eq 'True'))
{
Write-Host "Generating output files..." -foregroundColor Yellow
if($finallist.count -gt 0){
" " | add-content .\LocationsOnHold.txt
"Exchange Locations" | add-content .\LocationsOnHold.txt
"==================" | add-content .\LocationsOnHold.txt 
$newhold.ExchangeLocation.name | add-content .\LocationsOnHold.txt}
if($excludedlist.count -gt 0){
" "| add-content .\LocationsNotOnHold.txt
"Mailboxes not added to the hold" | add-content .\LocationsNotOnHold.txt
"===============================" | add-content .\LocationsNotOnHold.txt
$excludedlist | add-content .\LocationsNotOnHold.txt}
$FormatEnumerationLimit=-1
if($newhold.isvalid -eq 'True'){$newhold|fl >.\GetCaseHoldPolicy.txt}
if($newholdrule.isvalid -eq 'True'){$newholdrule|Fl >.\GetCaseHoldRule.txt}
}
}
else {"The hold wasn't created because no valid entries were found in the text file."}
""
#Disconnect from SCC PowerShell and PnPOnline

Write-host "Disconnecting from SCC PowerShell and PnP Online" -foregroundColor Yellow
Get-PSSession | Remove-PSSession
Write-host "Script complete!" -foregroundColor Yellow
""
#script end