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+<#
+=============================================================================================
+Name:           Audit Shared Mailbox Activities Using PowerShell 
+Version:        1.0
+Website:        o365reports.com
+
+Script Highlights: 
+~~~~~~~~~~~~~~~~~~
+
+1. The script retrieves audit log for the last 180 days by default. 
+2. Helps to generate audit reports for custom periods. 
+3. Tracks activities from a specific shared mailbox. 
+4. Exports shared mailbox activities performed by admins and delegated users. 
+5. Exports report results to CSV file. 
+6. The script can be executed with an MFA-enabled account too. 
+7. Supports Certificate-based Authentication too. 
+8. Automatically installs the EXO Module (if not installed already) upon your confirmation. 
+9. The script is scheduler friendly. 
+
+For detailed script execution:  https://o365reports.com/2024/09/24/audit-shared-mailbox-activities-using-powershell/
+============================================================================================
+#>
+
+Param
+(
+    [Parameter(Mandatory = $false)]
+    [Switch]$IncludeExternalAccess,
+    [Nullable[DateTime]]$StartDate,
+    [Nullable[DateTime]]$EndDate,
+    [string]$Organization,
+    [string]$ClientId,
+    [string]$CertificateThumbprint,
+    [string]$UserName,
+    [string]$Password,
+    [string]$SharedMailboxUPN
+)
+
+
+$MaxStartDate=((Get-Date).AddDays(-179)).Date
+
+
+#Retrive audit log for the past 180 days
+if(($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:$false
+ }
+}
+Connect_Exo
+
+#Get shared mailbox name
+if($SharedMailboxUPN -eq "")
+{
+ $SharedMailboxUPN= Read-Host "Enter shared mailbox name (eg: support@contoso.com)"
+}
+#Validate mailbox name
+ $MailboxDetails=Get-ExoMailbox -Identity $SharedMailboxUPN
+if(!($?))
+{
+ Write-Host The given mailbox $SharedMailboxUPN is not valid. Please provide a valid shared mailbox name. -ForegroundColor Red
+ Exit
+}
+$Location=Get-Location
+$OutputCSV="$Location\Audit_Shared_Mailbox_Activities_$((Get-Date -format yyyy-MMM-dd-ddd` hh-mm` tt).ToString()).csv"
+$IntervalTimeInMinutes=1440    #$IntervalTimeInMinutes=Read-Host Enter interval time period '(in minutes)'
+$CurrentStart=$StartDate
+$CurrentEnd=$CurrentStart.AddMinutes($IntervalTimeInMinutes)
+
+#Check whether CurrentEnd exceeds EndDate(checks for 1st iteration)
+if($CurrentEnd -gt $EndDate)
+{
+ $CurrentEnd=$EndDate
+}
+
+$AggregateResults = 0
+$CurrentResult= @()
+$CurrentResultCount=0
+$SMBActivitiesCount=0
+Write-Host `nRetrieving audit log from $StartDate to $EndDate... -ForegroundColor cyan
+
+while($true)
+{
+ #Write-Host Retrieving audit log between StartDate $CurrentStart to EndDate $CurrentEnd ******* IntervalTime $IntervalTimeInMinutes minutes
+ if($CurrentStart -eq $CurrentEnd)
+ {
+  Write-Host Start and end time are same.Please enter different time range -ForegroundColor Red
+  Exit
+ }
+
+
+ #Getting audit log for a given time range
+ else
+ { 
+  $Results=Search-UnifiedAuditLog -StartDate $CurrentStart -EndDate $CurrentEnd -Operations 'ApplyRecord','Copy','Create','FolderBind','HardDelete','SendAs','SendOnBehalf','MailItemsAccessed','MessageBind','Move','MoveToDeletedItems','RecordDelete','SoftDelete','Update','UpdateCalendarDelegation','UpdateFolderPermissions','UpdateInboxRules' -SessionId s -SessionCommand ReturnLargeSet -ResultSize 5000
+ }
+ 
+ $AllAuditData=@()
+ $AllAudits=
+ 
+ foreach($Result in $Results)
+ {
+
+  $MoreInfo=$Result.auditData
+  $AuditData=$Result.auditdata | ConvertFrom-Json
+  $Operation= $AuditData.operation
+  #Remove owner access
+  if($AuditData.LogonType -eq 0)
+  {
+   continue
+   
+  }
+  
+  #Filter for external access
+  if((!($IncludeExternalAccess.IsPresent)) -and ($AuditData.ExternalAccess -eq $true))
+  {
+   continue
+  }
+
+  #Processing shared mailbox access records
+  if(($AuditData.LogonUserSId -ne $AuditData.MailboxOwnerSid) -or ((($AuditData.Operation -eq "SendAs") -or ($AuditData.Operation -eq "SendOnBehalf")) -and ($AuditData.UserType -eq 0)))
+  {
+   $AuditData.CreationTime=(Get-Date($AuditData.CreationTime)).ToLocalTime()
+   if($AuditData.LogonType -eq 1)
+   {
+    $LogonType="Administrator"
+   }
+   elseif($AuditData.LogonType -eq 2)
+   {
+    $LogonType="Delegated"
+   }
+   else
+   {
+    $LogonType="Microsoft datacenter"
+   }
+   if($AuditData.Operation -eq "SendAs")
+   {
+    $AccessedMB=$AuditData.SendAsUserSMTP
+    $AccessedBy=$AuditData.UserId
+   }
+   elseif($AuditData.Operation -eq "SendOnBehalf")
+   {
+    $AccessedMB=$AuditData.SendOnBehalfOfUserSmtp
+    $AccessedBy=$AuditData.UserId
+   }
+   else
+   {
+    $AccessedMB=$AuditData.MailboxOwnerUPN
+    $AccessedBy=$AuditData.UserId
+   }
+
+   #Filter the result for specific mailbox
+   if(($AccessedMB -eq $AccessedBy) -or ($AccessedMB -ne $SharedMailboxUPN))
+   { 
+    Continue
+   }
+
+
+  $SMBActivitiesCount++
+  $AllAudits=@{'Activity Time'=$AuditData.CreationTime;'Performed by'=$AccessedBy;'Performed Operation'=$AuditData.Operation;'Shared Mailbox Name'=$AccessedMB;'Logon Type'=$LogonType;'Result Status'=$AuditData.ResultStatus;'External Access'=$AuditData.ExternalAccess;'More Info'=$MoreInfo}
+  $AllAuditData= New-Object PSObject -Property $AllAudits
+  $AllAuditData | Sort 'Activity Time' | select 'Activity Time','Shared Mailbox Name','Performed Operation','Performed by','Result Status','Logon Type','External Access','More Info' | Export-Csv $OutputCSV -NoTypeInformation -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
+}
+#Open output file after execution
+else
+{
+ Write-Host `nThe output file contains $SMBActivitiesCount audit records
+ if((Test-Path -Path $OutputCSV) -eq "True")
+ {
+  Write-Host `nThe 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
\ No newline at end of file