Migration from Microsoft Outlook to Kolab

[Thinker Rix]

Hi all,

the time has come and we will now migrate to Kolab finally.

Currently we have 4 users using Microsoft Outlook (with MS Windows) on 
as stand alone application (i.e. without any groupware server such as 
Microsoft Exchange, etc.). Each of those users saves his email and other 
PIM data such as address book, calendar, tasks and notes inside his 
personal file (.pst).
Now what we want to do is to migrate windows to GNU/Linux and Outlook to 
Kontact. Aditionally we want to install Kolab to act as a PIM server for 
Kontact.

What we want to ask is:
- How do we migrate those .pst files to Kontact/Kolab in the easiest and 
most solid way? We have seen https://wiki.kolab.org/Microsoft_Exchange 
but could not really make head or tail of it, since there are multiple 
solutions listed, but no recommendation and many things seem outdated 
(speaking about Kolab 2.1 etc.). Further some of the solutions talk 
about how to migrate MS Exchange, but we do not need that. We have only 
Microsoft Outlook as stand alone application. So: Could anybody give us 
a suggestion/hint/advice/feedback on how to migrate from Outlook 2007 to 
Kontact / Kolab 3.1 in the best and easiest way?
- Will we be able to migrate anything from the .pst (including tasks and 
notes) or only parts of it?
- Is there anything special to know and keep in mind for this migration?

Thank you for any feedback!!
Thinker Rix