OnePlace Solutions Server Components
OnePlace Solutions server Components should be configuration.
As discussed with Adrian Zurcher, The FileToWSS call (/_vti_bin/FileToWSS.asmx), is to check if you have server components installed. In some scenarios (when the SharePoint environment has external data/BCS columns), users of OnePlaceMail would like to see these external columns. However, Marsh doesn’t have any BCS columns so therefore doesn’t require server components to be installed, hence you receive 404 error (file not found) when making FiletoWSS call.
Please note, this is just a check to see if the server component is installed on your SharePoint site and is a normal behaviour of OnePlaceMail.
Thanks for the feedback and suggestion Rintu