I would like to know if there is any tool for migrating from ARM mcu's to Atmel? can any one help me on this topic?
Don't expect ARM employees to give you their email addresses or skype IDs, because if they did that, they would drown in support questions and become stressed and probably burned out.
(They have a lot to do already and are working hard on bringing us new and improved technology).
Instead, I would like to encourage you to ask ARM-related questions here (like you did already); but start a new thread for each question, so that if other people have similar questions, they might find the answers to your question useful / helpful.
I'd also like to encourage you to post status updates, when you achieved one of your goals or when you have progress in something you're working on.
People who follow you, might suddenly find one of your status updates interesting and give you some hints or tips.