Hi,
Are you using Enterprise or Standard?
Microsoft Exchange 2000 Enterprise Server:
• Database size is limited only by hardware (with a maximum size of 16 terabytes).
• Up to four storage groups can be created on server.
• Up to five information stores can exist in each storage group.
• One mailbox store database and one public folder store database that can be accessed by using MAPI and Outlook Web Access
• Up to four more public folder store databases that are only accessible programmatically
• Maximum 16-gigabyte (GB) database limit per database
Note Individual database size is the combined size of the .edb file and the .stm file for that database.
The limitations to Microsoft Exchange 2000 Server Standard Edition include:
• Four storage groups can be created on a server.
• One mailbox store database and one public folder store database that can be accessed by using MAPI and Outlook Web Access
• Up to four more public folder store databases that are only accessible programmatically
• Maximum 16-gigabyte (GB) database limit per database
You could always think about upgrading to 2003 or even 2007. I don't know if there's a limit on the mailbox numbers to be honest (I did an exchange course ages ago and can't remember the exact details) but think it runs into the tens of thousands..
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