web-based email and POP/IMAP access front end for Exchange server

[Scott H]

I have an Exchange server for company mail for
about 1400 users.  My boss wants web-based email
and POP/IMAP access from the Internet.  He agrees
with me putting Exchange and Outlook Web Access
out there is not a good idea, from a security
standpoint.  So we're looking for a good OSS
solution.  I know I can use products like
squirrelmail and Horde's IMP to provide a
web-based email front end, but how can I provide
POP/IMAP clients access to their Exchange
mailboxes, without opening up ports to the
Exchange box?  Is there OSS software that will do
this?  

Thanks,  
Scott




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