Designing an Exchange Front-end/Back-end OWA Architecture
The ability to configure front-end servers is a new concept introduced in Exchange 2000 and improved upon in Exchange Server 2003. Exchange 5.5 allowed an ASP-based front-end server for Outlook Web Access by enabling a dedicated IIS server to handle OWA client traffic, but Exchange 2000/2003 enables an increased degree of flexibility by offloading all protocols and enabling load balancing of those servers.
Front-end servers contain no mailboxes, and proxy HTTP, POP3, and IMAP traffic to a back-end server. They cannot, however, handle MAPI request in the same way, because MAPI clients must communicate directly with the server containing the client's mailbox. The term back-end server refers ...
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