Upgrade Ubuntu 6.10 server to 7.04 server

I just upgrade my Ubuntu Server 6.10 to Ubuntu server 7.04.
Let me show you which server software I have now with version.
OS: Ubuntu 6.10 > 7.04
Control Panel: Webmin 1.320 > 1.340
DNS server: Bind 9.32 > 9.34
Web server: Apache 2.0.55 > 2.2.3
FTP server: ProFTPD Server 1.30
Database server: MySQL version 5.0.24 > 5.0.38
SSH server: OpenSSH_4.3
SMTP server: Postfix version 2.3.3 > 2.3.8
POP/IMAP server: Dovecot IMAP/POP3 Server 1.0
Webalizer: Webalizer version 2.01-10