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Exchange 5.5 Single Instance Message

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by shanghai sam

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I need more information on Exchange Server 5.5 and Exchange 2K single instance message. Specifically the following comment..."There is a common misconception that the primary benefit of single instance storage is that it greatly reduces the storagespace requirements for user data on a mail server." So, if a 10mb emaial is sent to 100 recipients are the resources on the server decreased by 1000mb or 10mb + pointer if all recipients retain the email?

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by brasslet

In the case you provide, the space used by the message is 10Mb plus a small amount of overhead for the pointer. Without SIS, you'd use around 1000Mb. SO in this case, the disk savings are significant -- as long as users don't delete the mail. The more users delete the message, the less you benefit from SIS. If after a month 90 users delete the message in your example, your approx. 100 to 1 ratio goes down to 10 to 1. That's why MS states that the disk space savings are not the primary benefit -- the biggest gains are realized from reduced load on the network and servers.

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