I'm going to move this to Network and Share, a great place to ask other customers for this kind of advice. I'd suggest you follow that space and create an email filter, so you can see threads that may interest you and help you with your use of ServiceMax.
I see that Michael Dirks provided the link to the Salesforce Help & Training article on how to setup Email-to-Case. Did you get a chance to check it out? Email-to-Case is fairly easy to setup and this article is outstanding. Inside of it, you will find links to other articles on this topic to help you along the way. Email-to-Case is a great feature to incorporate in your system. It allows your customers and support teams to correspond via email, all while keeping those email communications on the case. No more copying and pasting from your email inbox into Case Comments!
If the link that Michael provided answered your question, I encourage you to mark your question answered.