Graph APIs Support for On-premise Exchange server
Are there any ways to use Graph APIs to talk to an on prem Exchange? I know that they can talk to a cloud only or hybrid setup but is it also possible to be able to use this for an on prem only kind of setup? If not what is an alternative API that can be used to integrate an application to talk to cloud, hybrid and on prem only deployments? Will I need to have different implementations that use Graph for the first two and something else like exchange web services API for on prem exchange or is there an easier way?