How to do these ??

Hi ,

We are in process of porting the exchange server 5.5 to RH Linux 7.2 
sendmail. Could the list guide me on how to proceed on followings ?

1) Porting of Global Address List from Exchange server to Linux and then 
also making available through LDAP. How to configure the LDAP ?

2) Porting of Public Folders from Exchange Server to Linux ? is there a 
way ?
3) Scheduling/ Calendering on Linux Sendmail
4) Porting of mail boxes fom Exchange server to Linux sendmail server.
5) Porting of Front Page Intranet to Linux ? which web server ? how to 
configure ?

version of sendmail on my Linux server is 8.11.6-3

any help is highly appreciated

regards
anil bindal