What's the real difference between Standard and Enterprise Editions of Exchange Server 2003 ?

MS has posted a new KB 822440 that describes the difference between Standard edition and Enterprise edition of Exchange Server 2003. This is a nice short list and helps us remember that Front End servers do not need to be Enterprise Edition...

Common FeaturesBoth editions of Exchange 2003 feature:

• Network compression
• Exchange 2003 Management Pack
• Integrated support for mobile devices
• Volume Shadow Copy service
• Ability to be configured as a front-end server for Microsoft Outlook Web Access, Microsoft Outlook Mobile Access, Microsoft ActiveSync, Post Office Protocol 3 (POP3), Internet Message Access Protocol (IMAP), and Simple Mail Transfer Protocol (SMTP)
• Recovery Storage Group
  

Exchange Server 2003 Standard Edition

Exchange 2003 Standard Edition is designed to meet the messaging and collaboration requirements of small and medium corporations and for specific messaging server roles or branch offices.

• 4 storage groups
• 1 private database
• 5 databases per storage group
• 16 gigabyte (GB) database limit
• Exchange clustering is not supported
• X.400 connector is not included
  

Exchange Server 2003 Enterprise Edition

Exchange 2003 Enterprise Edition is designed for large enterprise corporations. With Exchange 2003 Enterprise Edition, you can create multiple storage groups and multiple databases. Exchange 2003 Enterprise Edition provides an unlimited message store that removes the constraints on how much data a single server can manage.

• 4 storage groups
• 5 databases per storage group
• 16 terabyte database limit, limited only by hardware
• Exchange clustering is supported
• X.400 connector is included