Comments on: How does Exchange server 2003 store email? http://itknowledgeexchange.techtarget.com/itanswers/how-does-exchange-server-2003-store-email/ Tue, 21 May 2013 09:44:41 +0000 hourly 1 By: wrobinson http://itknowledgeexchange.techtarget.com/itanswers/how-does-exchange-server-2003-store-email/#comment-50670 wrobinson Wed, 21 Nov 2007 06:48:12 +0000 #comment-50670 You should also know that if the message is changed in any way by one of the recipients then an additional copy is spawned.

]]> By: dpnocc http://itknowledgeexchange.techtarget.com/itanswers/how-does-exchange-server-2003-store-email/#comment-37792 dpnocc Thu, 14 Dec 2006 10:24:54 +0000 #comment-37792 Thanks, all. This is very helpful!

]]> By: swiftd http://itknowledgeexchange.techtarget.com/itanswers/how-does-exchange-server-2003-store-email/#comment-37793 swiftd Wed, 13 Dec 2006 21:51:38 +0000 #comment-37793 I’m not 100% certain about distribution groups, but the Information store uses Single-instance message storage for each message store, as described below. It is my belief that distribution groups work the same way, as they are simply a group of users on that Exchange server. There should be a single message ID created with ACLs per user that is permitted to view the message. When users “delete” the message, they are effectively removing themselves to access the message via changing the ACL (Exchange controls it). Once the last person “deletes” the message, it is removed from the storage group during a normal IS maintenance schedule.

Extracted from: http://www.msexchange.org/articles/Understanding-Exchange-Information-Store.html
Exchange utilizes what Microsoft terms a single-instance message store. This single-instance message store works on a per database basis. What does this mean? If an e-mail message is sent to multiple mailboxes that are all in the same database, the message is stored once and each mailbox has a pointer to the message. The transaction is also logged in the transaction logs for the Storage Group that contains the database. However, if the e-mail message is sent to multiple mailboxes that are located in different databases, the message is copied to each database and written to the transaction logs for each Storage Group that contains the database with a copy of the message.

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