imap caching e-mail server

i use mailtrust an outsourced e-mail provider - they use imap
 - for e-mail at a few of my clients.

many clients have e-mail on more than one computer.  say
e-mail is on their laptop and on their desktop for instance
like i mine is.

everytime one switches from laptop to desktop, all the e-mail must be
re-downloaded.  if there are large attachments, this takes time.

what I am looking for is imap server software that will keep the imap e-mail
for the company locally, by synchronizing with mailtrust.com ... then the
clients can synchronize to it.

right now when users log on to windows and boot up outlook, e-mail is
synched between mailtrust and that instance of outlook for that user.  this
can be slow.  also we use outlook in a citrix environment, so they could get
put on a server that hasn't had e-mail sync'ed with mailtrust in a while.

so to make it so that users get a much faster synchronization of their
e-mail once they start outlook from a locally help repository of e-mail and
likewise to speed up any citrix server that may need to download e-mail for
any user, I was wondering if there is software that can sit sort of like an
imap proxy -- hold kind of a local cache of the imap e-mail at mailtrust.com
for the domain to allow for fast local synchronization to laptops, desktops,
different servers running outlook.

thanks,
gsgi
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