exchange server features

[Vano Tsertsvadze]

Does freebsd support features like shared folders, calendars, as MS exchange
Server does?
I use Windows and Exchange Server in LAN, but for extranet, the mail and
web-aplications are running under Freebsd.
It'd be great to have posibilities to build exchange like system on freebsd
and sendmail.
Did anyone hear something about exchange-like soft under freebsd?
 
Thanks,
AzIzA