Exam Profile: MCITP 70-663: Designing and Deploying Messaging Solutions with Microsoft Exchange Server 2010
The key to passing this exam is to have a thorough knowledge of Microsoft’s recommended best practices for Exchange 2010. This exam also focuses heavily on deployment planning, so focus your studies around migration and coexistence issues.
I would also recommend that you acquire a product such as Trancender that can provide you with some sample questions. It will help you to get a better feel for the types of questions that Microsoft asks on this exam.