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Identify Non-Compliant Shared Mailboxes
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AdminDroid
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<#
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=============================================================================================
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Name: Identify Non-Compliant Shared Mailboxes in Microsoft 365
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Version: 1.0
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Website: o365reports.com
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Script Highlights:
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~~~~~~~~~~~~~~~~~
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1. Generates all non-compliant shared mailboxes in Microsoft 365.
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2. Exports report results to CSV file.
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3. The script automatically verifies and installs the MS Graph PowerShell SDK and Exchange Online PowerShell modules (if they are not already installed) upon your confirmation.
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4. The script can be executed with an MFA-enabled account too.
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5. The script supports Certificate-based authentication (CBA).
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6. The script is scheduler-friendly.
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For detailed Script execution: https://o365reports.com/2024/12/10/identify-non-compliant-shared-mailboxes-in-microsoft-365/
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============================================================================================
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#>Param
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(
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[Parameter(Mandatory = $false)]
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[string]$ClientId,
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[string]$TenantId,
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[string]$Organization,
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[string]$CertificateThumbprint,
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[string]$UserName,
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[string]$Password
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)
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# Function to connect to Microsoft Graph
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function Connect_ToMgGraph {
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# Check if Microsoft Graph module is installed
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$MsGraphModule = Get-Module Microsoft.Graph -ListAvailable
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if ($MsGraphModule -eq $null) {
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Write-Host "`nImportant: Microsoft Graph module is unavailable. It is mandatory to have this module installed in the system to run the script successfully."
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$confirm = Read-Host "Are you sure you want to install Microsoft Graph module? [Y] Yes [N] No"
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if ($confirm -match "[yY]") {
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Write-Host "Installing Microsoft Graph module..."
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Install-Module Microsoft.Graph -Scope CurrentUser -AllowClobber
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Write-Host "Microsoft Graph module is installed in the machine successfully" -ForegroundColor Magenta
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} else {
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Write-Host "Exiting. `nNote: Microsoft Graph module must be available in your system to run the script" -ForegroundColor Red
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Exit
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}
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}
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Write-Host "`nConnecting to Microsoft Graph..."
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if (($TenantId -ne "") -and ($ClientId -ne "") -and ($CertificateThumbprint -ne "")) {
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# Use certificate-based authentication if TenantId, ClientId, and CertificateThumbprint are provided
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Connect-MgGraph -TenantId $TenantId -AppId $ClientId -CertificateThumbprint $CertificateThumbprint -NoWelcome
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} else {
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# Use delegated permissions (Scopes) if credentials are not provided
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Connect-MgGraph -Scopes "User.Read.All", "AuditLog.Read.All" -NoWelcome
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}
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# Verify connection
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if ((Get-MgContext) -ne $null) {
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Write-Host "Connected to Microsoft Graph successfully."
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} else {
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Write-Host "Failed to connect to Microsoft Graph." -ForegroundColor Red
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Exit
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}
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}
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# Function to connect to Exchange Online
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function Connect-Exo {
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try {
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# Check for Exchange Online module installation
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$ExchangeModule = Get-Module ExchangeOnlineManagement -ListAvailable
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if ($ExchangeModule.count -eq 0) {
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Write-Host "ExchangeOnline module is not available" -ForegroundColor Yellow
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$confirm = Read-Host "Do you want to Install ExchangeOnline module? [Y] Yes [N] No"
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if ($confirm -match "[Yy]") {
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Write-Host "Installing ExchangeOnline module ..."
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Install-Module ExchangeOnlineManagement -Repository PSGallery -AllowClobber -Force -Scope CurrentUser
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Import-Module ExchangeOnlineManagement
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} else {
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Write-Host "ExchangeOnline Module is required. To Install ExchangeOnline module use 'Install-Module ExchangeOnlineManagement' cmdlet."
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Exit
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}
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}
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# Connect Exchange Online module
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Write-Host "`nConnecting to Exchange Online module ..."
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if (($UserName -ne "") -and ($Password -ne "")) {
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$SecuredPassword = ConvertTo-SecureString -AsPlainText $Password -Force
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$Credential = New-Object System.Management.Automation.PSCredential $UserName, $SecuredPassword
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Connect-ExchangeOnline -Credential $Credential
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} elseif ($Organization -ne "" -and $ClientId -ne "" -and $CertificateThumbprint -ne "") {
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Connect-ExchangeOnline -AppId $ClientId -CertificateThumbprint $CertificateThumbprint -Organization $Organization -ShowBanner:$false
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} else {
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Connect-ExchangeOnline -ShowBanner:$false
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}
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Write-Host "Connected to Exchange Online successfully."
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} catch {
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Write-Host "Error connecting to Exchange Online: $_" -ForegroundColor Red
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Exit
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}
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}
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# Main Execution
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Connect_ToMgGraph
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Connect-Exo
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$ProgressIndex = 0
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$OutputCSV = "$(Get-Location)\NonCompliant_Shared_Mailboxes_$((Get-Date -Format 'yyyy-MM-dd_HH-mm-ss')).csv"
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$NonCompliantCount = 0
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$ExchangeOnlineServicePlans = @(
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"efb87545-963c-4e0d-99df-69c6916d9eb0", # EXCHANGE_S_ENTERPRISE(EXO Plan2)
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"9aaf7827-d63c-4b61-89c3-182f06f82e5c" # EXCHANGE_S_STANDARD (EXO Plan1)
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)
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# Retrieve all shared mailboxes
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Get-Mailbox -ResultSize Unlimited -RecipientTypeDetails SharedMailbox | ForEach-Object {
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$MailboxName = $_.DisplayName
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$ProgressIndex++
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Write-Progress -Activity "`n Processed shared mailbox count: $ProgressIndex"`n" Checking $MailboxName mailbox"
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# Retrieve additional details using Microsoft Graph
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$User = Get-MgUser -UserId $_.ExternalDirectoryObjectId -Property AccountEnabled, DisplayName, UserPrincipalName, SignInActivity |
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Select-Object DisplayName, UserPrincipalName, AccountEnabled, @{Name="LastSignInTime";Expression={$_.SignInActivity.LastSignInDateTime}}
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if ($User.AccountEnabled -eq $true) {
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$LicenseDetails = Get-MgUserLicenseDetail -UserId $User.UserPrincipalName
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$HasExchangeOnline = $false
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foreach ($License in $LicenseDetails) {
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foreach ($ServicePlan in $License.ServicePlans) {
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if ($ExchangeOnlineServicePlans -contains $ServicePlan.ServicePlanId) {
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$HasExchangeOnline = $true
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break
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}
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}
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if ($HasExchangeOnline) { break }
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}
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# Check for non-compliance
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if (-not $HasExchangeOnline) {
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$NonCompliantCount++
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# Gather all necessary properties
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$NonCompliantDetails = [PSCustomObject]@{
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"Shared Mailbox Name" = $User.DisplayName
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"Primary SMTP Address" = $_.PrimarySmtpAddress
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"Sign-In Enabled" = "Enabled"
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"Exchange License" = "No"
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"Last Sign-In Time" = if ($User.LastSignInTime -eq $null) { "Never logged-in" } else { $User.LastSignInTime }
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"Creation Time" = $_.WhenCreated
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}
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# Append to CSV
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$NonCompliantDetails | Export-Csv -Path $OutputCSV -NoTypeInformation -Append
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}
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}
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}
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Write-Host `n~~ Script prepared by AdminDroid Community ~~`n -ForegroundColor Green
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Write-Host "~~ Check out " -NoNewline -ForegroundColor Green; Write-Host "admindroid.com" -ForegroundColor Yellow -NoNewline; Write-Host " to get access to 1900+ Microsoft 365 reports. ~~" -ForegroundColor Green `n
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# Disconnect sessions
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#Disconnect-MgGraph | Out-Null
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#Disconnect-ExchangeOnline -Confirm:$false | Out-Null
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# Prompt to open CSV if non-compliant mailboxes exist
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if(Test-Path -Path $OutputCSV) {
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Write-Host " Found $NonCompliantCount non-compliant shared mailboxes." -ForegroundColor Yellow;
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Write-Host " Output CSV file saved to: " -NoNewline -ForegroundColor Yellow; Write-Host "$OutputCSV"
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$Prompt = New-Object -ComObject wscript.shell
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$UserInput = $Prompt.popup("Do you want to open the output file?",` 0,"Open Output File",4)
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if ($UserInput -eq 6) {
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Invoke-Item "$OutputCSV"
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}
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}
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else {
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Write-Host `n"No non-compliant shared mailboxes found."
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}
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