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Exchange Server 2003 Mailboxes

Posted on 2007-04-10
Last Modified: 2010-03-06
I would like to know what is the Maximum number of Mailboxes that I am allowed in Exchange server 2003 standard ?
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LVL 39

Expert Comment

ID: 18881355
There is no real limit on mailboxes per-se, you a limited in database size.


Author Comment

ID: 18881365
What is the Database limit as we are sitting at 25Gb.
LVL 39

Accepted Solution

redseatechnologies earned 50 total points
ID: 18881380
In SP2, it defaults at 18GB, and can be extended up to 75GB


That regkey will show you what you are at.  Obviously, don't set it larger than the size of the physical disk...


Expert Comment

ID: 18881394
One database per server

Maximum size of database: 18Gb (75Gb with SP2)

As far as I know mailboxes are only limited by actual database limits and physical disc space


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