We run a normal mail server on cPanel for web-based email. We've just got a request to add Calendar, address book, tasks functions; mobile capabilities (I'm guessing acces via a mobile client/app); public folders etc. On the client-side, we have some people using webmail, some use MS Outlook and some others use Mozilla Thunderbird. Having looked around, I zeroed in on SOGo, Citadel and kolab as options for this.

I read through SOGo's official install guide and also checked here and here. However, I see most of the HowTo's ask installation of MySQL/PgSQL, LDAP, Samba etc. While I can manage installation of Samba (if required), I have no idea if installing LDAP, MySQL etc is really required.

Also, any guidance as to how to install on a regular mail server would be appreciated.

Sorry if this sounds vague. If any more information is required, I'll be happy to give it.

Thanks in advance.

Edit:

This server in question has always been governed via cPanel (to install PHP, MySQL, configure DNS etc). So I am confused if really need LDAP.