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+<#
+=============================================================================================
+Name: Audit Email Deletions in shared mailbox using PowerShell
+Version: 1.0 
+Website: o365reports.com
+
+Script Highlights: 
+~~~~~~~~~~~~~~~~~
+1. The script automatically verifies and installs the Exchange Online PowerShell module (if not installed already) upon your confirmation. 
+2. Allows to track all shared mailbox email deletions.
+3. Tracks email deletions from a specific shared mailbox.
+4. Allows you to generate a shared mailbox email deletion audit report for a custom period.
+5. The script can be executed with MFA enabled account too.
+6. Exports a specific user’s email deletions activities in shared mailboxes.
+7. Filters deleted emails from shared mailbox by its subject. 
+8. It exports the report result to CSV format.
+9. It can be executed with Certificate-based Authentication (CBA) too.
+10. The script is scheduler friendly.
+
+For detailed script execution:https://o365reports.com/2025/03/11/audit-email-deletions-in-microsoft-365-shared-mailboxes-powershell/ 
+============================================================================================
+#>
+Param
+(
+    [Parameter(Mandatory = $false)]
+    [Nullable[DateTime]]$StartDate,
+    [Nullable[DateTime]]$EndDate,
+    [string]$SharedMBIdentity,
+    [string]$UserId,
+    [string]$Subject,
+    [string]$UserName,
+    [string]$Password,
+    [string]$Organization,
+    [string]$ClientId,
+    [string]$CertificateThumbprint
+)
+
+$MaxStartDate=((Get-Date).AddDays(-179)).Date
+
+
+#Retrive audit log for the past 180 days
+if(($StartDate -eq $null) -and ($EndDate -eq $null))
+{
+ $EndDate=(Get-Date).Date
+ $StartDate=$MaxStartDate
+}
+#Getting start date to audit export report
+While($true)
+{
+ if ($StartDate -eq $null)
+ {
+  $StartDate=Read-Host Enter start time for report generation '(Eg:09/24/2024)'
+ }
+ Try
+ {
+  $Date=[DateTime]$StartDate
+  if($Date -ge $MaxStartDate)
+  { 
+   break
+  }
+  else
+  {
+   Write-Host `nAudit can be retrieved only for the past 180 days. Please select a date after $MaxStartDate -ForegroundColor Red
+   return
+  }
+ }
+ Catch
+ {
+  Write-Host `nNot a valid date -ForegroundColor Red
+ }
+}
+
+
+#Getting end date to export audit report
+While($true)
+{
+ if ($EndDate -eq $null)
+ {
+  $EndDate=Read-Host Enter End time for report generation '(Eg: 9/24/2024)'
+ }
+ Try
+ {
+  $Date=[DateTime]$EndDate
+  if($EndDate -lt ($StartDate))
+  {
+   Write-Host End time should be later than start time -ForegroundColor Red
+   return
+  }
+  break
+ }
+ Catch
+ {
+  Write-Host `nNot a valid date -ForegroundColor Red
+ }
+}
+
+
+Function Connect_Exo
+{
+ #Check for EXO module inatallation
+ $Module = Get-Module ExchangeOnlineManagement -ListAvailable
+ if($Module.count -eq 0) 
+ { 
+  Write-Host Exchange Online PowerShell  module is not available  -ForegroundColor yellow  
+  $Confirm= Read-Host Are you sure you want to install module? [Y] Yes [N] No 
+  if($Confirm -match "[yY]") 
+  { 
+   Write-host "Installing Exchange Online PowerShell module"
+   Install-Module ExchangeOnlineManagement -Repository PSGallery -AllowClobber -Force
+  } 
+  else 
+  { 
+   Write-Host EXO module is required to connect Exchange Online.Please install module using Install-Module ExchangeOnlineManagement cmdlet. 
+   Exit
+  }
+ } 
+ Write-Host Connecting to Exchange Online...
+ #Storing credential in script for scheduling purpose/ Passing credential as parameter - Authentication using non-MFA account
+ if(($UserName -ne "") -and ($Password -ne ""))
+ {
+  $SecuredPassword = ConvertTo-SecureString -AsPlainText $Password -Force
+  $Credential  = New-Object System.Management.Automation.PSCredential $UserName,$SecuredPassword
+  Connect-ExchangeOnline -Credential $Credential -ShowBanner:$false
+ }
+ elseif($Organization -ne "" -and $ClientId -ne "" -and $CertificateThumbprint -ne "")
+ {
+   Connect-ExchangeOnline -AppId $ClientId -CertificateThumbprint $CertificateThumbprint  -Organization $Organization -ShowBanner:$false
+ }
+ else
+ {
+  Connect-ExchangeOnline -ShowBanner:$false
+ }
+}
+Connect_Exo
+
+
+$OutputCSV=".\DeletedEmailsAuditReport_$((Get-Date -format yyyy-MMM-dd-ddd` hh-mm` tt).ToString()).csv" 
+$IntervalTimeInMinutes=1440    #$IntervalTimeInMinutes=Read-Host Enter interval time period '(in minutes)'
+$CurrentStart=$StartDate
+$CurrentEnd=$CurrentStart.AddMinutes($IntervalTimeInMinutes)
+
+#Check whether CurrentEnd exceeds EndDate
+if($CurrentEnd -gt $EndDate)
+{
+ $CurrentEnd=$EndDate
+}
+
+
+$CurrentResultCount=0
+$AggregateResultCount=0
+Write-Host `nRetrieving deleted emails from $StartDate to $EndDate...
+$ProcessedAuditCount=0
+$OutputEvents=0
+$ExportResult=""   
+$ExportResults=@()  
+$RetriveOperation="SoftDelete,HardDelete,MoveToDeletedItems"
+
+#Check whether to retrieve for all the Shared mailboxes or a specific mailbox
+if($SharedMBIdentity -eq "")
+{
+ $SMBs=(Get-Mailbox -ResultSize Unlimited -RecipientTypeDetails SharedMailbox).PrimarySMTPAddress
+}
+else
+{
+ #Checking whether the shared mailbox is available
+ if((Get-Mailbox -Identity $SharedMBIdentity -RecipientTypeDetails Sharedmailbox) -eq $null)
+ {
+  Write-Host Given Shared Mailbox does not exist. Please check the name. -ForegroundColor Red
+  exit
+ }
+}
+
+while($true)
+{ 
+ $ResultCount=0
+ #Getting email deleted audit data for given time range
+ if($UserId.Length -ne 0)
+ { 
+  $Results=Search-UnifiedAuditLog -UserIds $UserId -StartDate $CurrentStart -EndDate $CurrentEnd -Operations $RetriveOperation -SessionId s -SessionCommand ReturnLargeSet -ResultSize 5000 
+ }
+ else
+ { 
+  $Results=Search-UnifiedAuditLog -StartDate $CurrentStart -EndDate $CurrentEnd -Operations $RetriveOperation -SessionId s -SessionCommand ReturnLargeSet -ResultSize 5000 
+ }
+ $ResultCount=($Results | Measure-Object).count
+ foreach($Result in $Results)
+ {
+  $ProcessedAuditCount++
+  Write-Progress -Activity "`n     Retrieving email deletion activities from $CurrentStart to $CurrentEnd.."`n" Processed audit record count: $ProcessedAuditCount"
+  $MoreInfo=$Result.auditdata
+  $Operation=$Result.Operations
+  $AuditData=$Result.auditdata | ConvertFrom-Json
+  $TargetMailbox=$AuditData.MailboxOwnerUPN
+
+ 
+  $EmailSubject=$AuditData.AffectedItems.Subject
+  if($EmailSubject -eq $null)
+  {
+   $EmailSubject="-"
+  }
+  $ConversationCount=$EmailSubject.count
+  $Subjects=$EmailSubject -join ", "
+
+  #Filter emails by subject
+  if(($Subject.Length -ne 0) -and ($Subjects -notmatch $Subject))
+  { 
+   continue
+  } 
+
+  if($SharedMBIdentity -eq "")
+  {
+   if($SMBs -notcontains $TargetMailbox)
+   {
+    continue
+   }
+  }
+  elseif($TargetMailbox -ne $SharedMBIdentity)
+  {
+   continue
+  }
+
+  $ActivityTime=Get-Date($AuditData.CreationTime)  #(Get-Date($AuditData.CreationTime)).ToLocalTime() Uncomment to view the Activity Time in local time
+  $PerformedBy=$AuditData.userId
+  $ResultStatus=$AuditData.ResultStatus
+  $Folder=$AuditData.Folder.Path.Split("\")[1]
+  $EventData=$AuditData.EventData
+  
+  #Export result to csv
+  $OutputEvents++
+  $ExportResult=@{'Activity Time'=$ActivityTime;'Shared Mailbox Name'=$TargetMailbox;'Activity'=$Operation;'Performed By'=$PerformedBy;'No. of Emails Deleted'=$ConversationCount;'Email Subjects'=$Subjects;'Folder'=$Folder;'Result Status'=$ResultStatus;'Workload'=$Workload;'More Info'=$MoreInfo}
+  $ExportResults= New-Object PSObject -Property $ExportResult  
+  $ExportResults | Select-Object 'Activity Time','Shared Mailbox name','Performed By','Activity','No. of Emails Deleted','Email Subjects','Folder','Result Status','More Info' | Export-Csv -Path $OutputCSV -Notype -Append 
+ }
+
+  $currentResultCount=$CurrentResultCount+($Results.count)
+ $AggregateResults +=$Results.count
+ Write-Progress -Activity "`n     Retrieving audit log for $CurrentStart : $CurrentResultCount records"`n" Total processed audit record count: $AggregateResults"
+ if(($CurrentResultCount -eq 50000) -or ($Results.count -lt 5000))
+ {
+  if($CurrentResultCount -eq 50000)
+  {
+   Write-Host Retrieved max record for the current range.Proceeding further may cause data loss or rerun the script with reduced time interval. -ForegroundColor Red
+   $Confirm=Read-Host `nAre you sure you want to continue? [Y] Yes [N] No
+   if($Confirm -notmatch "[Y]")
+   {
+    Write-Host Please rerun the script with reduced time interval -ForegroundColor Red
+    Exit
+   }
+   else
+   {
+    Write-Host Proceeding audit log collection with data loss
+   }
+  }
+  #Check for last iteration
+  if(($CurrentEnd -eq $EndDate))
+  {
+   break
+  }
+  [DateTime]$CurrentStart=$CurrentEnd
+  #Break loop if start date exceeds current date(There will be no data)
+  if($CurrentStart -gt (Get-Date))
+  {
+   break
+  }
+  [DateTime]$CurrentEnd=$CurrentStart.AddMinutes($IntervalTimeInMinutes)
+  if($CurrentEnd -gt $EndDate)
+  {
+   $CurrentEnd=$EndDate
+  }
+
+  $CurrentResultCount=0
+  $CurrentResult = @()
+ }
+}
+Write-Host `n~~ Script prepared by AdminDroid Community ~~`n -ForegroundColor Green
+Write-Host "~~ Check out " -NoNewline -ForegroundColor Green; Write-Host "admindroid.com" -ForegroundColor Yellow -NoNewline; Write-Host " to get access to 1800+ Microsoft 365 reports. ~~" -ForegroundColor Green `n`n
+  
+If($AggregateResults -eq 0)
+{
+ Write-Host No records found
+}
+
+
+else
+{
+ Write-Host `nThe output file contains $OutputEvents audit records
+ if((Test-Path -Path $OutputCSV) -eq "True") 
+ {
+  Write-Host `n" The Output file available in:"  -NoNewline -ForegroundColor Yellow; Write-Host $OutputCSV 
+  $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 "$OutputCSV"   
+  } 
+ }
+}
+
+#Disconnect Exchange Online session
+Disconnect-ExchangeOnline -Confirm:$false -InformationAction Ignore -ErrorAction SilentlyContinue
\ No newline at end of file