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As of December 19, 2016, there will not be any 2016 Year End Updates for Microsoft Dynamics SL published, as there were no changes made by the federal government to the 2016 tax year regulations that pertain to the year end forms or electronic files provided by Microsoft Dynamics SL.
Here are links to the actual announcements on CustomerSource and PartnerSource to share with customers and colleagues:
If the event something changes, look on CustomerSource or PartnerSource for notifications.