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Dynamics NAV 2013 and Dynamics NAV 2013 R2 are reaching the end of mainstream support on January 9, 2018. Microsoft recommends customers using this version to upgrade to a newer version of Dynamics NAV in order to ensure supportability.
Customers who are currently on a service plan can continue to access the following benefits through CustomerSource:
Products Transitioning from Mainstream to Extended Support: These products are moving from Mainstream Support into Extended Support over the next year. Extended Support lasts for a minimum of 5 years and includes security updates at no cost, and paid non-security updates and support. Additionally, Microsoft will not accept requests for design changes or new features during the Extended Support phase.
For more details see: Support Lifecycle Information