<#
=============================================================================================
Name:           Export Exchange Online Non-audited mailbox Activities
Description:    This script exports non-audited mailbox activities to CSV file
Version:        1.0
Website:        o365reports.com
Script by:      O365Reports Team
For detailed script execution: https://o365reports.com/2022/05/31/identify-non-audited-mailbox-activities-and-take-necessary-actions
============================================================================================
#>
Param
(
    [Parameter(Mandatory = $false)]
    [string]$UserName = $NULL,
    [string]$Password = $NULL
)
$AuditAdmin = @("ApplyRecord", "Copy", "Create", "FolderBind", "HardDelete", "MailItemsAccessed", "Move", "MoveToDeletedItems", "RecordDelete", "Send", "SendAs", "SendOnBehalf", "SoftDelete", "Update", "UpdateCalendarDelegation", "UpdateFolderPermissions", "UpdateComplianceTag" , "UpdateInboxRules")
$AuditDelegate = @("ApplyRecord", "Create", "FolderBind", "HardDelete", "MailItemsAccessed", "Move", "MoveToDeletedItems", "RecordDelete", "SendAs", "SendOnBehalf", "SoftDelete", "Update", "UpdateFolderPermissions", "UpdateComplianceTag", "UpdateInboxRules")
$AuditOwner = @("ApplyRecord", "Create", "HardDelete", "MailboxLogin", "MailItemsAccessed", "Move", "MoveToDeletedItems", "RecordDelete", "Send", "SearchQueryInitiated", "SoftDelete", "Update", "UpdateCalendarDelegation", "UpdateFolderPermissions", "UpdateComplianceTag", "UpdateInboxRules")
function Connect_Exo {
    #Check for EXO v2 module inatallation
    $Module = Get-Module ExchangeOnlineManagement -ListAvailable
    if ($Module.count -eq 0) { 
        Write-Host "Exchange Online PowerShell V2 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 V2 module is required to connect Exchange Online.Please install module using Install-Module ExchangeOnlineManagement cmdlet." 
            Exit
        }
    } 
    Write-Host "Connecting to Exchange Online..."
    Import-Module ExchangeOnline -ErrorAction SilentlyContinue -Force
    #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
    }
    else {
        Connect-ExchangeOnline
    }
    Write-Host "ExchangeOnline PowerShell module is connected successfully"
}
$global:ExportCSVFileName = "Mailboxes_NonAuditingActions_Report_" + ((Get-Date -format "MMM-dd hh-mm-ss tt").ToString()) + ".csv"
function MailboxNotAudited {
    $Audit_Check = Get-OrganizationConfig | Select AuditDisabled
    if ($Audit_Check.AuditDisabled -eq $true) {
        Write-Host "Auditing is disabled in your organization."
        Exit
    }
    else {
        $MBCount = 0
        Get-Mailbox -ResultSize Unlimited | ForEach-Object {
            $MBCount = $MBCount + 1
            $Identity = $_.UserPrincipalName
            $Name = $_.DisplayName
            Write-Progress -Activity "Processing Mailbox: $Name" -Status "Processed Mailbox Count: $MBCount" 
            $MBInfo = Get-Mailbox -Identity $Identity | Select-Object AuditOwner, AuditAdmin, AuditDelegate, DefaultAuditSet
            $Owner_ActionAudited = $MBInfo.AuditOwner
            $Admin_ActionAudited = $MBInfo.AuditAdmin
            $Delegate_ActionAudited = $MBInfo.AuditDelegate
            $DefaultAuditSet = $MBInfo.DefaultAuditSet
            $Owner_ActionNotAudited = $AuditOwner | Where-Object { $_ -notin $Owner_ActionAudited }
            $Admin_ActionNotAudited = $AuditAdmin | Where-Object { $_ -notin $Admin_ActionAudited }
            $Delegate_ActionNotAudited = $AuditDelegate | Where-Object { $_ -notin $Delegate_ActionAudited }
            $AuditByPassEnabled = Get-MailboxAuditBypassAssociation -Identity $Identity | Select-Object AuditByPassEnabled
            if ($Owner_ActionNotAudited.count -eq 0) {
                $Owner_ActionNotAudited = "-"
            }
            if ($Admin_ActionNotAudited.count -eq 0) {
                $Admin_ActionNotAudited = "-"
            }
            if ($Delegate_ActionNotAudited.count -eq 0) {
                $Delegate_ActionNotAudited = "-"
            }
            if($DefaultAuditSet.count -eq 0){
                $DefaultAuditSet = "-"
            }
            $ExportResult = @{'Display Name' = $Name; 'Logon type with Default Audit Set' = $DefaultAuditSet -join(","); 'Audit By Pass Enabled' = $AuditByPassEnabled.AuditByPassEnabled; 'Owner' = $Owner_ActionNotAudited -join (","); 'Admin' = $Admin_ActionNotAudited -join (","); 'Delegate' = $Delegate_ActionNotAudited -join (",") }
            $ExportResults = New-Object PSObject -Property $ExportResult
            $ExportResults | Select-object 'Display Name', 'Audit By Pass Enabled', 'Logon type with Default Audit Set', 'Owner', 'Admin', 'Delegate' | Export-csv -path $global:ExportCSVFileName -NoType -Append -Force
        }
    }
}

Connect_Exo
MailboxNotAudited
if ((Test-Path -Path $global:ExportCSVFileName) -eq "True") {     
    Write-Host "Mailboxes and disabled auditing actions are exported. The report available in `"$global:ExportCSVFileName`"" -ForegroundColor Green 
    $prompt = New-Object -ComObject wscript.shell    
    $userInput = $prompt.popup("Do you want to open output files?", 0, "Open Output File", 4)    
    if ($userInput -eq 6) {    
        Invoke-Item "$global:ExportCSVFileName"
    }  
}
Disconnect-ExchangeOnline -Confirm:$false -InformationAction Ignore -ErrorAction SilentlyContinue
Write-Host "Disconnected active ExchangeOnline session"