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Powershell/PowerShell-Office365Admin/MSOnline/BulkAddLicenceConditional.ps1

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+# Bulk add a new licence to users on the basis of what licence they currently have
+#
+# This is useful for something like adding Office 365 ATP to everyone who currently has E3, for example.
+#
+
+# What licence do the users currently have?
+$existingLicence = ''
+
+# What licence are we adding?
+$licenceToAdd = ''
+
+# Import MSOnline module and connect
+Import-Module MSOnline
+Connect-MsolService
+
+# Find everyone who has the existing
+$users = Get-MsolUser -All | Where-Object {($_.licenses).AccountSkuId -match $existingLicence -and !(($_.licenses).AccountSkuId -match $licenceToAdd)}
+
+# Add the new licence
+foreach ($user in $users) {
+    Set-MSOLUserLicense -UserPrincipalName $user.UserPrincipalName –AddLicenses $licenceToAdd
+}