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Powershell/PowerShell-Office365Admin/AzureAD/BulkAddLicenceConditional.ps1

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+# Bulk add a new licence to users on the basis of what licence they currently have.
+#
+# An updated version of my previous MSOL script, now using AzureAD.
+# This is useful for something like adding Office 365 ATP to everyone who currently has E3, for example.
+#
+# List of available SKUs can be obtained with (Get-AzureADSubscribedSku).SkuPartNumber
+#
+
+# What licence do the users currently have?
+$existingLicence = 'ENTERPRISEPACK'
+
+# What licence are we adding?
+$licenceToAdd = 'ATP_ENTERPRISE'
+
+# Import AzureAD module and connect
+Import-Module AzureAD
+Connect-AzureAD
+
+# Get all available licence skus
+$allSkus = Get-AzureADSubscribedSku
+
+# Get sku ID for existing licence
+$existingSkuID = ($allSkus | Where-Object {$_.SkuPartNumber -eq $existingLicence}).SkuId
+
+# Get sku ID for new licence
+$newSkuID = ($allSkus | Where-Object {$_.SkuPartNumber -eq $licenceToAdd}).SkuId
+
+# Find everyone who has the existing licence but not the licence we're adding
+$users = Get-AzureADUser -All $true | Where-Object {$_.AssignedLicenses.SkuId -match $existingSkuID -and !($_.AssignedLicenses.SkuId -match $newSkuID)}
+
+# Create a new licence object for the licence we're adding
+$newLicense = New-Object -TypeName Microsoft.Open.AzureAD.Model.AssignedLicense
+$newLicense.SkuId = $newSkuID
+
+# Create a new assigned licenses object and add the licence we're adding to add licenses
+$newLicenses = New-Object -TypeName Microsoft.Open.AzureAD.Model.AssignedLicenses
+$newLicenses.AddLicenses = $newLicense
+
+# Add the new licence to each user in the list
+foreach ($user in $users) {
+    Set-AzureADUserLicense -ObjectId $user.UserPrincipalName -AssignedLicenses $newLicenses
+}
+
+# Disconnect from AzureAD
+Disconnect-AzureAD