Added Files

Powershell/PowerShell-Office365Admin/AzureAD/BulkDisableGuestAccounts.ps1

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+# Script to bulk disable guest accounts in Azure AD, either all or for a specific domain
+#
+
+# Are we disabling for a specific guest domain? Leave blank for all guests.
+$guestDomain = ''
+
+# Install the AzureAD module, uncomment if required
+#Install-Module -Name AzureAD
+
+# Import the AzureAD module and connect to Azure AD
+Import-Module -Name AzureAD
+Connect-AzureAD
+
+# Get a list of all guests from Azure AD either matching the domain or all guests
+if ($guestDomain -ne '') {
+    $guestAccounts = Get-AzureADUser -All $true | Where-Object { $_.AccountEnabled -eq $true -and $_.UserType -eq 'Guest' -and $_.Mail -like ('*' + $guestDomain) }
+}
+else {
+    $guestAccounts = Get-AzureADUser -All $true | Where-Object { $_.AccountEnabled -eq $true -and $_.UserType -eq 'Guest' }
+}
+
+# Disable the guest accounts
+try {
+    $guestAccounts | Set-AzureADUser -AccountEnabled $false -ErrorAction Stop
+    Write-Output -InputObject ('The specified guest accounts have been disabled.')
+}
+catch {
+    Write-Output -InputObject ('Failed - The specified guest accounts have not been disabled.')
+}