Hi :)
you can use evolution mail to communicate with m$ exchange via owa(outlook web access).
For all the M$ Office stuff you can use OpenOffice 3.0 and to communicate with windows shared folders you have to use samba. But as far as i know ubuntu comes up with all of these programs.
Cheers

Hi,
at the moment I try to write a content filter for postfix. The filter should check the incoming mails and write them into my database. Postfix connects succesfully to my service but I don't get any content. Now my querstion: How can I get the Mailbody, Header, recipient and Sender into my service?

master.cf

smtp inet n - - - - smtpd
-o smtpd_proxy_filter=127.0.0.1:10025
-o smtpd_client_connection_count_limit=20