For use with ASSP Toolbar for Outlook 2.5.x or later, enable this setting to specify the serial number of the toolbar licence to use for clients.
Paste in the serial number you received after purchasing your licence.
When specifying the serial number, you also need to enable and specify the release code setting.
NB: Each licence allows installation on a specified number of workstations. You must ensure you do not roll-out a licence to more workstations than it is licensed for.