The following components can be connected to WebOffice author standalone:
•ArcGIS Server map services (via REST)
•ArcMap-documents
•ArcGIS Pro-documents
•UserManagement-databases
•WebOffice applications
The connections are displayed in the left hand side of the footer. A green point symbolize a successfull connection, a red point a not successfull connection.

WebOffice author standalone: connections
Note: The connection of ArcGIS Server map services is not implemented yet.