Hi we have exchange 2007 in our organization and would like to know, that if i send an email with attachment to internal users would that attachment go to all users or it that attachment is sitting in a central depository and all users are pointed to that mailbox any explanation would be appreciated, so does that attachment takes the user mailbox size. and what happens when i delete that email with the attachment my mailbox sizes reduces Thanks AK

In E2k7 attachments are single instanced, but message bodies are not. Read more about single instance in 2007 here http://blogs.technet.com/b/exchange/archive/2008/02/08/3404852.aspx

In E2k7 attachments are single instanced, but message bodies are not. Read more about single instance in 2007 here http://blogs.technet.com/b/exchange/archive/2008/02/08/3404852.aspx

Thanks for the info so if I am the recipient of the email with attachment does it takes the user mailbox size. and what happens when i delete that email with the attachment my mailbox sizes reduces. AK

Yes and Yes, if you remove and purge it from deleted items as well.

Yes and Yes, if you remove and purge it from deleted items as well.