While I usually only blog about SharePoint, since Exchange is part of the Office 365, this might interest some of you!
Microsoft just announced they are giving away 350 free 70-345 : Designing and Deploying Microsoft Exchange Server 2016 exams for those of you who want to try it! Oh, and you need to register AND take the exam before February 12! The goal is for Microsoft to get feedback to make the exam better, so make sure that if you take the beta, you give a lot of feedback!
You can view the exam details and register directly on the site: https://www.microsoft.com/en-us/learning/exam-70-345.aspx
Use code EXCH2016010B to take it for free, but these codes are only valid for exam dates on or before Feb. 12, 2016.
EDIT: For clarification purposes with the new Pearon System. You enter this code after choosing your Center, Date and Time. You enter this code when entering payment details.
Unfortunately, this offer is not available in Turkey, Pakistan, India, China, and Vietnam.
Also, keep in mind that this exam is in beta, which means that you will not be scored immediately. You will receive your final score and passing status once the exam is live.