It pays to be quick here, Microsoft is offering the first 350 people the opportunity to take the Exchange 2016 exam 70-345 free of charge.
The exam must be taken by 12.02.2016. It is a beta exam, but if you pass, the result will remain valid.
Click here for more information:
You can register for the exam here:
https://www.microsoft.com/en-us/learning/exam-70-345.aspx
In the last step before payment this promo code must be entered: EXCH2016010B
Good luck!