The IPCC express version used in the UCCX exam 642-164 is not posted in the exam requirement. I read through some previous posts and I am still unclear whether it is 4.x or 5.x. If some one has the answer to this kindly post a reponse.
You need to be familiar with 4.x for sure. I remember some 5.x questions as well though. I suspect it was written for 4.x and only minor tweaks have been made since then.
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