This document discloses a system and method that assists in collecting, integrating, and displaying calendar data from a plurality of data source applications includes several components. In one implementation, a first client connector communicates with a first client application. A plurality of data source connectors communicate with a plurality of data source applications. Each data source connector communicates with a data source application. An integrator performs multiple functions. It receives a first calendar data request from the first client application through the first client connector. It also retrieves a plurality of calendar data items corresponding to the first calendar data request from two or more of the data source applications through the respective data source connectors. It integrates the plurality of calendar data items into a first integrated calendar data set. And, it transmits the first integrated calendar data set to the first client application through the first client connector.