The Relay Server enables secure, load-balanced communication between mobile devices and back-end servers through a web server. Supported back-end servers include Afaria, Mobile Office, MobiLink, SQL Anywhere, Unwired Server, and Sybase Unwired Platform. The Relay Server provides the following:

• A common communication architecture for mobile devices communicating with back-end servers.
• A mechanism to enable a load-balanced and fault-tolerant environment for back-end servers.
• A way to help communication between mobile devices and back-end servers in a way that integrates easily with existing corporate firewall configurations and policies.