Is Kolab for me

[Duffields]

We have five computers on a small LAN connected to the WAN by a single router.  
About six months ago, I decided to give Linux a serious try and now have both 
Ubuntu or Xandros installed on four of the five machines (one uses Windows 
XP).  It has been a bit of a trial but it all works.... sort of.

We want to allow all computers to share a common email, contact list, and 
calendar.   It appears that the best solution would be to install an IMAP 
server on one of the desktop machines but I know very little about such 
things.  Since, after trying out several PIM applications, it appears that 
Kontact is the best for our needs, it would seem to make sense to install 
Kolab as the IMAP server, but I wonder if it is overkill.

Having used Ubuntu for about six months, I know a little bit about Linux but 
not much about networking and almost nothing about servers so my questions 
are: 
1. Is Kolab suitable for this application or is it too much for our needs?
2. Can someone with almost no knowledge about server applications to set up 
and maintain Kolab?  According to a Kolab website, documentation for Kolab 2 
is only available in German and  though my daughter studied it,I do not know 
German myself.

Any advice would be appreciated.

Thanks
Mac