diff --git a/Office 365 Non-owner Mailbox Access Report/NonOwnerMBAccessReport.ps1 b/Office 365 Non-owner Mailbox Access Report/NonOwnerMBAccessReport.ps1
new file mode 100644
index 0000000..cbb6253
--- /dev/null
+++ b/Office 365 Non-owner Mailbox Access Report/NonOwnerMBAccessReport.ps1	
@@ -0,0 +1,253 @@
+Param
+(
+    [Parameter(Mandatory = $false)]
+    [switch]$MFA,
+    [Boolean]$IncludeExternalAccess=$false,
+    [Nullable[DateTime]]$StartDate,
+    [Nullable[DateTime]]$EndDate,
+    [string]$UserName,
+    [string]$Password
+)
+
+#Getting StartDate and EndDate for Audit log
+if ((($StartDate -eq $null) -and ($EndDate -ne $null)) -or (($StartDate -ne $null) -and ($EndDate -eq $null)))
+{
+ Write-Host `nPlease enter both StartDate and EndDate for Audit log collection -ForegroundColor Red
+ exit
+}   
+elseif(($StartDate -eq $null) -and ($EndDate -eq $null))
+{
+ $StartDate=(((Get-Date).AddDays(-90))).Date
+ $EndDate=Get-Date
+}
+else
+{
+ $StartDate=[DateTime]$StartDate
+ $EndDate=[DateTime]$EndDate
+ if($StartDate -lt ((Get-Date).AddDays(-90)))
+ { 
+  Write-Host `nAudit log can be retrieved only for past 90 days. Please select a date after (Get-Date).AddDays(-90) -ForegroundColor Red
+  Exit
+ }
+ if($EndDate -lt ($StartDate))
+ {
+  Write-Host `nEnd time should be later than start time -ForegroundColor Red
+  Exit
+ }
+}
+
+
+#Authentication using MFA 
+if($MFA.IsPresent) 
+{ 
+ $MFAExchangeModule = ((Get-ChildItem -Path $($env:LOCALAPPDATA+"\Apps\2.0\") -Filter CreateExoPSSession.ps1 -Recurse ).FullName | Select-Object -Last 1) 
+ If ($MFAExchangeModule -eq $null) 
+ { 
+  Write-Host  `nPlease install Exchange Online MFA Module.  -ForegroundColor yellow  
+  Write-Host You can manually install module using below blog : `nhttps://o365reports.com/2019/04/17/connect-exchange-online-using-mfa/ `nOR you can install module directly by entering "Y"`n 
+  $Confirm= Read-Host `nAre you sure you want to install module directly? [Y] Yes [N] No 
+  if($Confirm -match "[Y]") 
+  {  
+   Start-Process "iexplore.exe" "https://cmdletpswmodule.blob.core.windows.net/exopsmodule/Microsoft.Online.CSE.PSModule.Client.application" 
+  } 
+  else 
+  { 
+   Start-Process 'https://o365reports.com/2019/04/17/connect-exchange-online-using-mfa/' 
+   Exit 
+  } 
+  $Confirmation= Read-Host Have you installed Exchange Online MFA Module? [Y] Yes [N] No  
+  if($Confirmation -match "[yY]") 
+  { 
+   $MFAExchangeModule = ((Get-ChildItem -Path $($env:LOCALAPPDATA+"\Apps\2.0\") -Filter CreateExoPSSession.ps1 -Recurse ).FullName | Select-Object -Last 1) 
+   If ($MFAExchangeModule -eq $null) 
+   { 
+    Write-Host Exchange Online MFA module is not available -ForegroundColor red 
+    Exit 
+   } 
+  } 
+  else 
+  {  
+   Write-Host Exchange Online PowerShell Module is required 
+   Start-Process 'https://o365reports.com/2019/04/17/connect-exchange-online-using-mfa/' 
+   Exit 
+  }     
+ } 
+  
+ #Importing Exchange MFA Module 
+ . "$MFAExchangeModule" 
+ Write-Host Enter credential in prompt to connect to Exchange Online 
+ Connect-EXOPSSession -WarningAction SilentlyContinue  
+} 
+
+#Authentication using non-MFA 
+else 
+{ 
+ #Storing credential in script for scheduling purpose/ Passing credential as parameter 
+ if(($UserName -ne "") -and ($Password -ne "")) 
+ { 
+  $SecuredPassword = ConvertTo-SecureString -AsPlainText $Password -Force 
+  $Credential  = New-Object System.Management.Automation.PSCredential $UserName,$SecuredPassword 
+ } 
+ else 
+ { 
+  $Credential=Get-Credential -Credential $null 
+ }  
+ $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $Credential -Authentication Basic -AllowRedirection -WarningAction SilentlyContinue 
+ Import-PSSession $Session -AllowClobber -DisableNameChecking | Out-Null 
+} 
+
+$OutputCSV=".\NonOwner-Mailbox-Access-Report_$((Get-Date -format yyyy-MMM-dd-ddd` hh-mm` tt).ToString()).csv" 
+$IntervalTimeInMinutes=1440    #$IntervalTimeInMinutes=Read-Host Enter interval time period '(in minutes)'
+$CurrentStart=$StartDate
+$CurrentEnd=$CurrentStart.AddMinutes($IntervalTimeInMinutes)
+$Operation='ApplyRecord','Copy','Create','FolderBind','HardDelete','MessageBind','Move','MoveToDeletedItem','RecordDelete','SendAs','SendOnBehalf','SoftDelete','Update','UpdateCalendarDelegation','UpdateFolderPermissions','UpdateInboxRules'
+
+
+#Check whether CurrentEnd exceeds EndDate(checks for 1st iteration)
+if($CurrentEnd -gt $EndDate)
+{
+ $CurrentEnd=$EndDate
+}
+
+$AggregateResults = 0
+$CurrentResult= @()
+$CurrentResultCount=0
+$NonOwnerAccess=0
+Write-Host `nRetrieving audit log from $StartDate to $EndDate... -ForegroundColor Yellow
+
+while($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 Non-Owner mailbox access for a given time range
+ else
+ {
+  $Results=Search-UnifiedAuditLog -StartDate $CurrentStart -EndDate $CurrentEnd -Operations $Operation -SessionId s -SessionCommand ReturnLargeSet -ResultSize 5000
+ }
+ $AllAuditData=@()
+ $AllAudits=
+ foreach($Result in $Results)
+ {
+  $AuditData=$Result.auditdata | ConvertFrom-Json
+
+  #Remove owner access
+  if($AuditData.LogonType -eq 0)
+  {
+   continue
+  } 
+
+  #Filter for external access
+  if(($IncludeExternalAccess -eq $false) -and ($AuditData.ExternalAccess -eq $true))
+  {
+   continue
+  }
+
+  #Processing non-owner mailbox access records
+  if(($AuditData.LogonUserId -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.MailboxOwnerUPN
+   }
+   elseif($AuditData.Operation -eq "SendOnBehalf")
+   {
+    $AccessedMB=$AuditData.SendOnBehalfOfUserSmtp
+    $AccessedBy=$AuditData.MailboxOwnerUPN
+   }
+   else
+   {
+    $AccessedMB=$AuditData.MailboxOwnerUPN
+    $AccessedBy=$AuditData.UserId
+   }
+   if($AccessedMB -eq $AccessedBy)
+   {
+    Continue
+   }
+  $NonOwnerAccess++
+  $AllAudits=@{'Access Time'=$AuditData.CreationTime;'Accessed by'=$AccessedBy;'Performed Operation'=$AuditData.Operation;'Accessed Mailbox'=$AccessedMB;'Logon Type'=$LogonType;'Result Status'=$AuditData.ResultStatus;'External Access'=$AuditData.ExternalAccess}
+  $AllAuditData= New-Object PSObject -Property $AllAudits
+  $AllAuditData | Sort 'Access Time','Accessed by' | select 'Access Time','Logon Type','Accessed by','Performed Operation','Accessed Mailbox','Result Status','External Access' | Export-Csv $OutputCSV -NoTypeInformation -Append
+ }
+ }
+ Write-Progress -Activity "`n     Retrieving audit log from $StartDate to $EndDate.."`n" Processed audit record count: $AggregateResults"
+ #$CurrentResult += $Results
+ $currentResultCount=$CurrentResultCount+($Results.count)
+ $AggregateResults +=$Results.count
+ 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
+  $CurrentResult = @()
+ }
+}
+
+If($AggregateResults -eq 0)
+{
+ Write-Host No records found
+}
+#Open output file after execution
+else
+{
+ Write-Host `nThe output file contains $NonOwnerAccess audit records
+ if((Test-Path -Path $OutputCSV) -eq "True") 
+ {
+  Write-Host `nThe Output file available in $OutputCSV -ForegroundColor Green
+  $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"   
+  } 
+ }
+}