Multi-Site MXgroup™ : extends full MX functionality across multiple locations, making separate offices appear as a single entity. Users at one location can communicate with users at any other location in the same way they communicate with users at their own location. The MX250 systems communicate with each other in an MXgroup configuration (with or without MXcluster™) over a WAN or the Internet with minimal bandwidth requirements. MXgroups are easily configured. No intervention is required by the users of the systems.