diff --git a/Find Inactive Distribution Lists/FindInactiveDistributionLists.ps1 b/Find Inactive Distribution Lists/FindInactiveDistributionLists.ps1
new file mode 100644
index 0000000..2c743fe
--- /dev/null
+++ b/Find Inactive Distribution Lists/FindInactiveDistributionLists.ps1	
@@ -0,0 +1,193 @@
+ <#
+=============================================================================================
+Name: Find Inactive Distribution Lists Using PowerShell
+Version: 1.0
+Website: o365reports.com
+
+~~~~~~~~~~~~~~~~~
+Script Highlights: 
+~~~~~~~~~~~~~~~~~
+1. The script automatically verifies and installs the Exchange PowerShell module (if not installed already) upon your confirmation.   
+2. Exports inactive days of distribution lists in Microsoft 365. 
+3. Retrieves the last email received date.  
+4. Exports report results to CSV.  
+5. The script is schedular-friendly.  
+6. It can be executed with certificate-based authentication (CBA) too.  
+
+For detailed script execution: https:https://o365reports.com/2024/07/09/find-inactive-distribution-lists-using-powershell/
+
+=============================================================================================
+#> 
+param(
+    [string] $CertificateThumbPrint,
+    [string] $ClientId,
+    [string] $Organization,
+    [string] $UserName,
+    [string] $Password,
+    [String]$HistoricalMessageTraceReportPath
+)
+
+if($HistoricalMessageTraceReportpath)
+{
+    if (-not (Test-Path $HistoricalMessageTraceReportPath -PathType Leaf)) 
+    {
+        Write-Host "`nError: The specified CSV file does not exist or is not accessible." -ForegroundColor Red
+        Exit
+    } 
+}
+else
+{
+    Write-Host "`nInput file path is required" -ForegroundColor Red
+    Exit
+}
+
+Function ConnectEXO
+{
+    #check for EXO installation
+    $Module=Get-Module ExchangeOnlineManagement -ListAvailable
+    if($Module.count -eq 0)
+    {
+        Write-Host Exchange online powershell is not available -ForegroundColor Yellow
+        $Confirm = Read-Host Are you sure want to install module? [Y] Yes [N] No
+        if($Confirm -match "[yY]")
+        {
+            Write-Host Installing Exchange Online Powershell module
+            Install-Module -Name ExchangeOnlineManagement -Repository PSGallery -AllowClobber -Force -scope CurrentUser
+            Write-Host ExchangeOnlineManagement installed successfully...
+        }
+        else
+        {
+            Write-Host EXO module is required to connect Exchange Online.Please Install-module ExchangeOnlineManagement.
+            Exit
+        }
+    }
+    Write-Host "`nConnecting to Exchange Online..."
+    try{
+        #connect to Exchange Online 
+        if(($Organization -ne "") -and ($ClientId -ne "") -and ($CertificateThumbPrint -ne ""))
+        {
+            #Connect Exchange online using Certificate based Authentication 
+            Connect-ExchangeOnline -CertificateThumbprint $CertificateThumbPrint -AppId $ClientId -Organization $Organization -ErrorAction stop -ShowBanner:$false
+        }
+        elseif(($UserName -ne "") -and ($Password -ne ""))
+        {
+            #Connect Exchange online using username and password
+            $SecuredPassword = ConvertTo-SecureString -AsPlainText $Password -Force
+            $Credential = New-Object System.Management.Automation.PSCredential $UserName, $SecuredPassword
+            Connect-ExchangeOnline -Credential $Credential -ErrorAction stop -ShowBanner:$false
+        }
+        else
+        {
+            Connect-ExchangeOnline -ErrorAction stop -ShowBanner:$false
+        }
+    }
+    catch
+    {
+        Write-Host "Error occurred: $($_.Exception.Message )" -ForegroundColor Red
+        Exit
+    }
+    Write-Host "`nExchangeonline connected successfully" -ForegroundColor Green
+}
+
+Function GettingDistributionLists{
+    Get-DistributionGroup -ResultSize unlimited | Where-Object{$_.RecipientTypeDetails -eq "MailUniversalDistributionGroup"} | ForEach-Object{
+        ForEach($Email in $_.EmailAddresses){
+            $Mail = (($Email).split(":") | Select -Index 1)
+            $global:DistributionLists[$Mail] = $_.PrimarySmtpAddress
+        }
+    }
+}
+
+Function FindDifference{
+    param(
+        $DateTime
+    )
+
+    $DayDifference = (New-TimeSpan -Start $DateTime -End (Get-Date)).Days
+    $DayDifference = "$DayDifference" + " Days"
+    return $DayDifference
+}
+
+Function GettingInactiveDistributionLists
+{
+    # Read the original CSV file content
+    $originalContent = Get-Content -Path $HistoricalMessageTraceReportPath
+    # Remove non-printable characters (if any)
+    $sanitizedContent = $originalContent -replace '[^\P{C}]', ''
+    Set-Content -Path $HistoricalMessageTraceReportPath -Value $sanitizedContent
+
+    Import-CSV -path $HistoricalMessageTraceReportPath | Foreach-Object {
+        $RecipientAddresses = $_.'recipient_status' -Split ';'
+        ForEach($RecipientAddress in $RecipientAddresses){
+            $Recipient = $RecipientAddress -Split "##" | select -Index(0)
+            $DL = $global:DistributionLists.$Recipient
+            if($DL)
+            {
+                $LastEmail = Get-Date -Date $($_.'origin_timestamp_utc')
+                $LastEmailReceived = $LastEmail.ToString("dd-MM-yyyy  HH:mm:ss")                
+                $Difference = FindDifference -DateTime $LastEmail
+                if($global:InactiveDistributionLists.$DL)
+                {
+                    $Last = $global:InactiveDistributionLists.$DL[0]
+                    if($Last -lt $LastEmailReceived)
+                    {
+                        $global:InactiveDistributionLists.$DL[0] = $LastEmailReceived
+                        $global:InactiveDistributionLists.$DL[1] = $Difference
+                    }
+                }
+                else
+                {
+                    $global:InactiveDistributionLists[$DL] = @($LastEmailReceived,$Difference)
+                }
+            }
+        }
+    }
+}
+
+#To connect exchangeonline
+ConnectEXO
+#Hashmap to store  distribution lists
+$global:DistributionLists = @{}
+write-Host "`nGetting inactive distribution lists. This may take some time to process based on the input given..."
+#To Get all the distribution lists including alias
+GettingDistributionLists
+#To store the Inactive DistributionLists
+$global:InactiveDistributionLists = @{}
+GettingInactiveDistributionLists
+
+$global:CSVFile = "InactiveDistributionLists_" + ((Get-Date -format "MMM-dd hh-mm-ss tt").ToString()) + ".csv"
+
+
+ForEach($DistributionList in $global:DistributionLists.GetEnumerator()){
+    $DL = $($DistributionList.Name) 
+    if($DL -eq $($DistributionList.Value)){
+        if($global:InactiveDistributionLists.$DL)
+        {
+            $LastEmailReceivedDate = $global:InactiveDistributionLists.$DL[0]
+            $InactiveDays = $global:InactiveDistributionLists.$DL[1]
+        }
+        else
+        {
+            $LastEmailReceivedDate = "No data available"
+            $InactiveDays = "Inactive for longer than the selected time range."
+        }
+        $ExportResult = @{'Group Name' =$DL; 'Last Email Received Date' = $LastEmailReceivedDate; 'Inactive Days' = $InactiveDays }
+        $ExportResults = New-Object PSObject -Property $ExportResult
+        $ExportResults | Select-object 'Group Name', 'Last Email Received Date', 'Inactive Days' | Export-csv -path $global:CSVFile -NoType -Append -Force
+    }
+}
+
+$Location = Get-Location
+if (((Test-Path -Path $global:CSVFile) -eq "True")) {     
+    Write-Host "`nThe output file " -NoNewline -ForegroundColor yellow; Write-Host $global:CSVFile -NoNewline -ForegroundColor Cyan; Write-Host " is available in the directory $Location " -ForegroundColor Yellow
+    $prompt = New-Object -ComObject wscript.shell    
+    $UserInput = $prompt.popup("Do you want to open output file?", 0, "Open Output File", 4)    
+    if ($UserInput -eq 6) {
+        Invoke-Item "$global:CSVFile"
+    }
+}
+
+Disconnect-ExchangeOnline -Confirm:$false
+
+Write-Host `n~~ Script prepared by AdminDroid Community ~~`n -ForegroundColor Green
+Write-Host "~~ Check out " -NoNewline -ForegroundColor Green; Write-Host "admindroid.com" -ForegroundColor Yellow -NoNewline; Write-Host " to get access to 1800+ Microsoft 365 reports. ~~" -ForegroundColor Green `n`n
\ No newline at end of file