Added Files

Powershell/PowerShell-Office365Admin/AzureAD/GetADGUIDFromAzureAD.ps1

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+# Import the Azure AD module and connect
+Import-Module AzureAD
+Connect-AzureAD
+
+# Whose ID are we getting?
+$userUPN = Read-Host -Prompt 'Enter user''s UPN in the format username@domain'
+
+# Convert 365 ImmutableID to AD GUID
+$immutableID = (Get-AzureADUser -ObjectId $userUPN).ImmutableID
+[GUID][System.Convert]::FromBase64String($immutableID)