Upgade my Postfix cyrus email and add LDAP directory.

[Richmond Dyes]

I have been running Cyrus 2.0.9-3 and Postfix 20010202-4 as my email 
server for 2 years. It has been running without a hitch. I do have 
several concerns.  With it not being upgraded, I worry that I am way 
behind on security patches and not taking advantages of new 
capabilities.  I also want to add LDAP to this configuration to take 
advantage of the directory capabilities.  I am using sasl authentication 
with my server. I am running these levels of software:

cyrus-sasl-1.5.25-17
cyrus-imapd-2.0.9-3
postfix-20010202-4
db3-3.2.9-4

1.  What do I have to do to upgrade my server to the latest Postfix and 
Cyrus software.
2.   How do I add an LDAP directory to my server and make it useful for 
my users?

I know this may sound simple but I am in a production environment and 
don't have the resources for a test server so I have one shot at this. 
 Any help would be great appreciated.