networking the sent folder

I

IMC

We have 3 computers at our business and use a network to share files/folders.
We also have the email synched. Everyone recieves all the same email and it
goes to the inbox. The problem is, if Computer 1 replies to an email.
Computer 2 and Computer 3 won't ever know unless we walk over to computer 1
and open their outlook and look at their sent messages. We need to have the
sent mail synched the same way the inbox is synched. I need to know if
someone on a different computer, than mine, replied to an email.
 
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