Update: Microsoft has identified a condition where Free/Busy lookups from On-Premises to O365 in a hybrid configuration may fail. Please see KB4058297 for additional information and mechanisms to resolve this condition.The December quarterly release updates for Exchange Server are now available on the download center (links below). In addition to the planned cumulative updates for Exchange Server 2013 and 2016, we have published an update rollup for Exchange Server 2010. These releases include all previously released updates, fixes for customer reported issues and limited new functionality.
Note: Exchange Server 2010 is in extended support phase of lifecycle. Customers should not expect regular updates to this product. Updates are released on an as needed basis only.
Note: Customers can always use the latest cumulative update directly to install a newly provisioned server.
Reminder: Customers in hybrid deployments where Exchange is deployed on-premises and in the cloud, or who are using Exchange Online Archiving (EOA) with their on-premises Exchange deployment are required to deploy the most current (e.g., 2013 CU19, 2016 CU8) or the prior (e.g., 2013 CU18, 2016 CU7) Cumulative Update release.For the latest information on Exchange Server and product announcements please see What's New in Exchange Server 2016 and Exchange Server 2016 Release Notes. You can also find updated information on Exchange Server 2013 in What’s New in Exchange Server 2013, Release Notes and product documentation available on TechNet.
Note: Documentation may not be fully available at the time this post is published.The Exchange Team
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