Service Pack 2 for Exchange Server 2003 automatically increases your private mail store from 16 gigabytes (GB) to 18 GB. The service pack also enables you to increase your private mail store and your public folder store to 75 GB each. If you increase your stores beyond 18 GB, you must make sure that you have enough disk space for your database, prepare your server with the necessary hardware and software updates, and then edit the registry to set the new database size. This document takes you step-by-step through the process of increasing your private mail store size.

Step-by-Step Guide to Increasing the Exchange 2003 Private Mail Store Size on Windows Small Business Server 2003