multiplying entries in outlook group calendar

I created a group account in Kolab and a file
<group>.pst for each user.
This pst-file was connected to this group in Kolab via
Toltec Connector 

in XML-format.
All worked fine for a few weeks, but then entries within the
group
calendar
were multiplied. I thought of a mistake of mine and deleted
all
pst-files
and the group account. All was set up new but after while
the entries 
were multiplied again.
What is the reason for this and is there a script to delete
the
multiplied
entries ?
Any hints to solve this problem ?

Thanks in advance




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