To successfully compete in today's challenging business climate, organizations must enable more efficient ways for knowledge workers to communicate and collaborate. E-mail is currently the most widely used collaborative technology. More businesses use Exchange Server for e-mail-based collaboration than any other product.

Exchange Server 2003 enables knowledge workers to gain access to critical business communications almost whenever and wherever they need to and is designed to deliver greater security, availability and reliability. Exchange Server 2003 is available in two editions.

Exchange Server 2003 Standard Edition is designed to meet the messaging and collaboration needs of small and medium-size corporations. With Exchange Server 2003 Standard Edition, you get:

• Exchange Server 2003.
• The flexibility to be configured as a Microsoft Office Outlook Web Access front-end server.
• Mailbox stores and public folder stores that are each limited to 16-gigabyte (GB) maximum.
• Recovery Storage Group.

Exchange Server 2003 Enterprise Edition is designed for large enterprise corporations and enables you to create multiple storage groups and multiple databases. Exchange Server 2003 Enterprise Edition provides an 8-terabyte (TB) public folder store that eases the constraints on the amount of data that a single server can manage. With Exchange Server 2003 Enterprise Edition, you get:

• All the features and products included in Exchange Server 2003 Standard Edition.
• Database size limited only by your hardware (with a maximum size of 16 terabytes).
• Multiple databases per server.
• Clustering support for four nodes on Microsoft Windows 2000 Advanced Server or eight nodes on Microsoft Windows Server 2003 Enterprise Edition.