powershell-scripts/Office 365 User Last Logon Time Report/LastLogonTimeReport.ps1

#Accept input parameter
Param
(
    [Parameter(Mandatory = $false)]
    [int]$InactiveDays,
    [switch]$UserMailboxOnly,
    [switch]$ReturnNeverLoggedInMB,
    [string]$UserName,
    [string]$Password,
    [switch]$MFA

)

#Check for MSOnline module
$Modules=Get-Module -Name MSOnline -ListAvailable
if($Modules.count -eq 0)
{
  Write-Host  Please install MSOnline module using below command: `nInstall-Module MSOnline  -ForegroundColor yellow
  Exit
}

#Connect AzureAD and Exchange Online from PowerShell
Get-PSSession | Remove-PSSession

#Get friendly name of license plan from external file
$FriendlyNameHash=Get-Content -Raw -Path .\LicenseFriendlyName.txt -ErrorAction Stop | ConvertFrom-StringData


#Set output file
$ExportCSV=".\LastLogonTimeReport_$((Get-Date -format yyyy-MMM-dd-ddd` hh-mm` tt).ToString()).csv"

#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 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
   $Confirm= Read-Host Are you sure you want to install module directly? [Y] Yes [N] No
   if($Confirm -match "[yY]")
   {
     Write-Host Yes
     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
  . "$MFAExchangeModule"
  Write-Host Enter credential in prompt to connect to Exchange Online
  Connect-EXOPSSession -WarningAction SilentlyContinue
  Write-Host Connected to Exchange Online
  Write-Host `nEnter credential in prompt to connect to MSOnline
  #Importing MSOnline Module
  Connect-MsolService | Out-Null
  Write-Host Connected to MSOnline `n`nReport generation in progress...
 }
 #Authentication using non-MFA
 else
 {
  #Storing credential in script for scheduling purpose/ Passing credential as parameter
  if(($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
  }
  Connect-MsolService -Credential $credential
  $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $Credential -Authentication Basic -AllowRedirection
  Import-PSSession $Session -CommandName Get-Mailbox,Get-MailboxStatistics -FormatTypeName * -AllowClobber | Out-Null
 }

$Result=""
$Output=@()
$MBUserCount=0
$OutputCount=0


Get-Mailbox -ResultSize Unlimited | Where{$_.DisplayName -notlike "Discovery Search Mailbox"} | ForEach-Object{
 $upn=$_.UserPrincipalName
 $CreationTime=$_.WhenCreated
 $LastLogonTime=(Get-MailboxStatistics -Identity $upn).lastlogontime
 $DisplayName=$_.DisplayName
 $MBType=$_.RecipientTypeDetails
 $Print=1
 $MBUserCount++
 $RolesAssigned=""
 Write-Progress -Activity "`n     Processed mailbox count: $MBUserCount "`n"  Currently Processing: $DisplayName"

 #Retrieve lastlogon time and then calculate Inactive days
 if($LastLogonTime -eq $null)
 {
   $LastLogonTime ="Never Logged In"
   $InactiveDaysOfUser="-"
 }
 else
 {
   $InactiveDaysOfUser= (New-TimeSpan -Start $LastLogonTime).Days
 }

 #Get licenses assigned to mailboxes
 $User=(Get-MsolUser -UserPrincipalName $upn)
 $Licenses=$User.Licenses.AccountSkuId
 $AssignedLicense=""
 $Count=0

 #Convert license plan to friendly name
 foreach($License in $Licenses)
 {
    $Count++
    $LicenseItem= $License -Split ":" | Select-Object -Last 1
    $EasyName=$FriendlyNameHash[$LicenseItem]
    if(!($EasyName))
    {$NamePrint=$LicenseItem}
    else
    {$NamePrint=$EasyName}
    $AssignedLicense=$AssignedLicense+$NamePrint
    if($count -lt $licenses.count)
    {
      $AssignedLicense=$AssignedLicense+","
    }
 }
 if($Licenses.count -eq 0)
 {
  $AssignedLicense="No License Assigned"
 }

 #Inactive days based filter
 if($InactiveDaysOfUser -ne "-"){
 if(($InactiveDays -ne "") -and ([int]$InactiveDays -gt $InactiveDaysOfUser))
 {
  $Print=0
 }}

 #License assigned based filter
 if(($UserMailboxOnly.IsPresent) -and ($MBType -ne "UserMailbox"))
 {
  $Print=0
 }

 #Never Logged In user
 if(($ReturnNeverLoggedInMB.IsPresent) -and ($LastLogonTime -ne "Never Logged In"))
 {
  $Print=0
 }

 #Get roles assigned to user
 $Roles=(Get-MsolUserRole -UserPrincipalName $upn).Name
 if($Roles.count -eq 0)
 {
  $RolesAssigned="No roles"
 }
 else
 {
  foreach($Role in $Roles)
  {
   $RolesAssigned=$RolesAssigned+$Role
   if($Roles.indexof($role) -lt (($Roles.count)-1))
   {
    $RolesAssigned=$RolesAssigned+","
   }
  }
 }

 #Export result to CSV file
 if($Print -eq 1)
 {
  $OutputCount++
  $Result=@{'UserPrincipalName'=$upn;'DisplayName'=$DisplayName;'LastLogonTime'=$LastLogonTime;'CreationTime'=$CreationTime;'InactiveDays'=$InactiveDaysOfUser;'MailboxType'=$MBType; 'AssignedLicenses'=$AssignedLicense;'Roles'=$RolesAssigned}
  $Output= New-Object PSObject -Property $Result
  $Output | Select-Object UserPrincipalName,DisplayName,LastLogonTime,CreationTime,InactiveDays,MailboxType,AssignedLicenses,Roles | Export-Csv -Path $ExportCSV -Notype -Append
 }
}

#Open output file after execution
Write-Host `nScript executed successfully
if((Test-Path -Path $ExportCSV) -eq "True")
{
 Write-Host Result contains $OutputCount mailboxes
 Write-Host "Detailed report available in: $ExportCSV"
 $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 "$ExportCSV"
 }
}
Else
{
  Write-Host No mailbox found
}
#Clean up session
#Get-PSSession | Remove-PSSession