Exchange 2003 Mailstore- Qty of Mailbox Limit Best Practice Unity5.0

Unanswered Question
Oct 23rd, 2009

Is there a best practice for the amount of Mailboxes recommended for a single Exchange 2003 mailstore ?

I am aware that Mailbox limits can be enforced, but my question is how many boxes, not how much storage

Exchange 2003 Mailstore = 395GB

This is a Voicemail only Deployment

Environment Information:

Back end is Exchange 2003

Unity version = 5.0(1.0)

Patches installed:=CU5.0(1)_ES80


I have this problem too.
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virverma Fri, 10/23/2009 - 11:23

recommended number of mailboxes per a Exchange 2003 server is 5000,

TO view total number of mailboxes on exchange server,

-Go to ADUC, under Action Toolbar menu choose Find. On the Exchange tab

select users with mailboxes.

mdury Mon, 10/26/2009 - 15:32


Can you tell me where you referenced that information?

Thank you for your response

virverma Mon, 10/26/2009 - 17:41

I found the information in one of technical threads, if you want a link for this, I can try it for you


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