If you have troubles in representing the print preview extent in the WebOffice 10.3 SP2 client (e.g. showing landscape, but portrait is configured), try the following workaround:

Faulty representation of the print preview extent in the WebOffice 10.3 SP2 client
| • | open the SynPlotService.mxd (<ArcGIS Server location>\directories\WebOfficePlotTemplates) |
| • | open the faulty layout file with WebOffice plot author |
| • | activate the dataframe print |
| • | save the layout |
| • | restart the service SynerGIS WebOffice Extensions (depending on the version also restart COM+ services) |
| • | restart the SynOutputService |