Microsoft has released Security Updates (SUs) for vulnerabilities found in:
Exchange Server Subscription Edition (SE)
Exchange Server 2019
Exchange Server 2016
SUs are available for the f...
Updated Sep 24, 2026
Version 4.0
Blog Post
We are also having the same search index issues as described by others here. Happened immediately after this September SU - we've never had index/search issues prior to this. BigFunnelIndexCount is not going down. Failing over to another DAG node will process some items, but then queues up again. Keep seeing these errors in the BigFunnel Retry Feeder logs:
Microsoft.Exchange.Assistants.DatabaseIneptException
--> Microsoft.Exchange.Assistants.SaveControlDataException:
Failed to save control data for assistant
BigFunnelRetryFeederTimeBasedAssistant.
Item state is Running.
--> Microsoft.Exchange.Data.Storage.ConnectionFailedTransientException:
Cannot set properties.
--> Microsoft.Mapi.MapiExceptionNetworkError:
MapiExceptionNetworkError:
Unable to set properties on object.
(hr=0x80040115, ec=0)