Message Delivery

You can minimize server load by having users designate personal folder (.pst) files as the default delivery location for messages instead of server-based storage. This offloads server processing and frees it to perform other tasks. Whenever a user requests data from a personal folder, the server does not read the attributes and data into the buffer cache. Instead, all of the processing occurs on the client because that is where the data is located. The server does not have to be involved at all. If a user saves a copy of everything in the Sent Mail folder, the process is performed locally. Also, when a user deletes a message, a copy is saved in the local Deleted Items folder, and, again, the server is not involved.