Implementing Task and Session Extensions

As shown in the following table, the client extension implements the TASK, SESSION, and VIEWER contexts with only the IExchExt : IUnknown interface using the IExchExt:Install method (and the IUnknown::Release method).

The following table summarizes the interaction between a user, Microsoft Exchange and an extension object when a user launches Microsoft Exchange or logs on to a MAPI session. It also shows which component — Microsoft Exchange or the client extension — performs the step and in the case of the client extension, what method is invoked.