Thin client (computing) : a server-centric computing model in which the application software, data, and CPU power resides on a network server rather than on the client computer.

However, you can configure POP3 to leave the mail on the server and run it as a server-centric-type protocol as well, thus changing the cost of running POP3 clients against your DPARs.

These applications are file-centric and benefit from incremental deployments which have minimal impact on the operation of the server.