Would forwarding an email with attachments use up twice space?

I remember if you send one email with 1 MB attachment file to 5 recipients, it actually only uses up 1 MB space in Exchange database.
But what if one of the above five recipients forwards that exactly same email (with 1 MB attachment file, remember? ) to another 3 different users? Would it use up another additional 1 MB? or not?
CastlewoodAsked:
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Scott CConnect With a Mentor Senior Systems EnginerCommented:
Nope.  Single instance rules still apply.  Now if the email is forwarded externally then back in, then it would take up additional space because at that point, the single instance has been broken.  But once it's back inside the single instance would once again take effect.
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CastlewoodAuthor Commented:
what if the user saves the attachment file to his hard drive and then attach it without changing anything, not even the file name, to an email. Would it use up another 1 MB in the Exchange db ?
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Scott CSenior Systems EnginerCommented:
Yes, in that case it would.  As long as the attachment stays in the email thread, single instance will be maintained.  Once it leaves the thread it will count as a different file.
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