Tip of the day!!
In you Exchange environment you may have noticed that you are sitting with a 2GB Temp Folder after a CU has been installed.
This is normal if you install a CU. You can go ahead and remove the ExchangeSetup folder in this location: %systemRoot%\Temp\ExchangeSetup but do take note that it will be re-created again when you apply the next CU.
Hope it helps.