Internet Explorer by default adds an extra page at the end of a duplex print job when it has an odd number of pages.
To avoid the adding of an extra page, on your Pharos Print Servers you need to set the value of the registry key “No Blank Pages” to ‘1’. By default the value is set to ‘0’.
Where to find the registry key:
My Computer \ HKEY_LOCAL_MACHINE\SOFTWARE\Pharos\Page Counter