Exchange 2007, deduplication, distribution groups

If I send an email with an attachment to a distribution list with 5 recipients, does that attachment and email take up 5 times the amount of space on the server?

I thought I read that the Exchange database only keeps one instance of that email and attachment, but I can't find that article. Maybe I mis-read it? THanks
fina27Asked:
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esmith69Commented:
You are correct, it does NOT take up 5 times the amount of space.  Let me see if I can dig up an article.
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esmith69Commented:
OK, apparently in 2007 it only maintains the Single Instance Storage for attachments, not for actual emails.  From what I've heard, this feature is fairly resource intensive and I believe it may have been done away with completely in Exchange 2010.

http://www.msexchange.org/tutorials/Exchange-2007-Store-Related-Changes-Improvements.html

Near the middle of that page, right above the red section heading called "Transaction Log File Size Changes".
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fina27Author Commented:
This is great! thanks
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