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Powershell/PowerShell-Office365Admin/AzureAD/BulkRemoveGuestsWithUnacceptedInvites.ps1

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+# Find all guests with unaccepted invites over a specific time period and remove them
+#
+
+# How many days are we allowing for invites to be accepted? (This can be 0 for all)
+$cutOffDays = 30
+
+# Install the AzureAD module, uncomment if required
+#Install-Module -Name AzureAD
+
+# Import the AzureAD module and connect to Azure AD
+Import-Module -Name AzureAD
+Connect-AzureAD
+
+# Get the cut off date
+$cutOffDate = (Get-Date).AddDays(-$cutOffDays)
+
+# Get a list of all guests with unaccepted invites older than the specificed timeframe
+$unacceptedGuests = Get-AzureADUser -All $true | Where-Object { $_.UserType -eq 'Guest' -and  $_.UserState -eq 'PendingAcceptance' -and $_.RefreshTokensValidFromDateTime -lt $cutOffDate }
+
+# Remove the guest accounts
+$unacceptedGuests | Remove-AzureADUser