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I am currently reviewing the setup for a medium size engineering firm. They have a main office and 4 small satellite offices. The main office has an exchange server (2003?) that the satellite offices POP. What are some better ways of handling this situation. All of the satellite offices use basic peer-to-peer networking and there is no real need to have them authenticate to the network at the main office. They do not share files.
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I am currently reviewing the setup for a medium size engineering firm. They have a main office and 4 small satellite offices. The main office has an exchange server (2003?) that the satellite offices POP. What are some better ways of handling this situation. All of the satellite offices use basic peer-to-peer networking and there is no real need to have them authenticate to the network at the main office. They do not share files.

Advice on handling email for multiple offices

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.