kontact problem

[JOYDEEP]

Dear list,

I have enable kontact to communicate with kolab. I can successfully add
addressbook from kontact--> contact and can view the address-info any time

But when I check Kmail->kolab server -> inbox -> contact it reports

*This is a Kolab Groupware object.
To view this object you will need an email client that can understand
the Kolab Groupware format*

could any one kindly suggest what to do to fix the problem ?
I am using kolab 2.x and kontact 1.2

thanks for your support.