Added Files

Powershell/PowerShell-Office365Admin/MSOnline/ChangeOnlineUserUPN.ps1

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+# Update Online User UPN - when AD sync doesn't do it.
+
+# Import the MSOL module and connect
+Import-Module MSOnline
+Connect-MsolService
+
+# Whose UPN are we changing?
+$oldUPN = Read-Host -Prompt 'Enter user''s old UPN in the format username@domain'
+
+# What are we changing it to?
+$newUPN = Read-Host -Prompt 'Enter user''s new UPN in the format username@domain'
+
+# Change the UPN
+if (Get-ADUser -Identity $newUPN.Split('@')[0]) {
+    Set-MsolUserPrincipalName -UserPrincipalName $oldUPN -NewUserPrincipalName $newUPN
+}