09-08-2014 05:58 AM
I know it has to be deployed on a per-user basis.
The install registers classes for the files in the users AppData\Local\Swiftpage files, registers a browser helper object, and then runs regsvr32 to register slxotl32.dll. This is what actually adds the integration to Outlook.
We have done something similar to a mas deployment of desktop integrator in the past so I know it is possible from experience.