Exchange Server 2003 comes in two editions:
Standard Edition and Enterprise Edition.
•Exchange Server 2003 Standard Edition is designed to meet the messaging and collaboration needs of small and medium corporations, and for specific messaging server roles or branch offices.
•Exchange Server 2003 Enterprise Edition, designed for large enterprise corporations, enables you to create multiple storage groups and multiple databases. Exchange Server 2003 Enterprise Edition provides a 16-terabyte message store that removes the constraints on the number of users and amount of data that a single server can manage.
Both editions feature:
•Network compression. Microsoft Office Outlook 2003 is designed for optimum network performance and features attachment and e-mail body compression, fewer round trips between server and client, and more intelligent synchronization.
•Exchange Server 2003 Management Pack. Help monitor and proactively manage deployments with the Microsoft Operations Manager Management Pack.
•Integrated support for mobile devices. Get support for Windows Mobile–enabled mobile device synchronization for e-mail, contacts, and calendars plus mobile browsing capabilities.
•Volume Shadow Copy service. Use the Volume Shadow Copy service in Microsoft Windows Server 2003 to enable improved backup and restore capabilities, thereby reducing the impact to your users and increasing system availability.
•Flexible configuration. You can configure Exchange Server 2003 as a front-end server residing in either the perimeter network (also known as DMZ, demilitarized zone, and screened subnet) or behind the firewall to support multiple client types such as Outlook 2003 (using remote procedure call [RPC] over HTTP), Microsoft Office Outlook Web Access, Outlook Mobile Access, Exchange ActiveSync, Post Office Protocol 3 (POP3), and Internet Message Access Protocol (IMAP).
•Recovery Storage Group. Recover entire storage groups, databases, or individual mailboxes while minimizing impact to your users. This feature has the potential to replace the need for separate servers dedicated to recovery purposes.
| Feature | Standard | Edition Enterprise Edition |
| Storage groups support | 1 storage group | 4 storage groups |
| Number of databases per storage group | 1 mailbox store and 1 public folder store | 5 databases |
| Total database size | Maximum 16 gigabytes (GB) per database1 | Maximum 16 terabytes, limited only by hardware2 |
| Exchange Server clustering | Not supported | Supported |
| X.400 connector | Not included | Included |
1 Mailbox storage size limits increase to 75 GB for Exchange Server 2003 Standard Edition with Service Pack 2.
2 Sixteen terabytes of messaging storage is beyond most organizations’ requirements to meet service level agreements for timely messaging backup and restore.
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