DirSync & Azure AD Sync will reach end of Support on April 13, 2017.
Azure AD will stop accepting connections from DirSync and Azure AD Sync after December 31, 2017. For more information about the DirSync and AAD Sync upgrade, please see the DirSync and Azure AD Sync deprecation documentation. If you have questions or feedback about this change, you can leave the team a comment on the blog linked below or reach on Twitter using the #AzureAD hashtag.
So now, it’s time to get cracking and move to Azure AD Connect if you’ve not done so already: