Exchange Server caching

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I work in a large corperation with one large central site and 8 sub sites.
The powers that be deem is necessary that the central office be the location
for email servers for our company with all the sub sites leasing very
expensive 10-15MB/s ATM links to transport all our IP traffic back to the
main site. As of late outlook/exchange traffic has taken over most of our ATM
pipes and I am looking into saving bandwidth/money. Every time a company
wide/site wide email is sent every user utilizes bandwidth to receive that
message which can become costly since some remote sites have 1500+ people. Is
there a way I can do some sort of message trunking to the remotes sites, i.e.
an exchange server sitting at the remote sites that caches large distro
emails so that rather than going all the way back to the main site to receive
the message, the message can be downloaded once and kept local for like 2
weeks before being dropped.

Thanks in advance for any help you can provide.
.

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