Symptoms

On servers that are running Microsoft Exchange Server 2016 and that have Cumulative Update 4 or Cumulative Update 5 installed, you experience the following situations:

  • The Microsoft Exchange RPC Client Access service process (Microsoft.Exchange.RpcClientAccess.Server.exe) consumes excessive CPU resources on Exchange Server 2016-based servers.

  • A memory leak occurs in the Microsoft Exchange RPC Client Access service on Exchange Server 2016-based servers.

  • The Exchange application pools (EWS, RPC, MAPI, ActiveSync) on Exchange Server 2016-based servers experience high CPU usage and a memory leak.

Note If you have installed third-party email archiving software on Exchange Server 2016-based servers, this issue might be worsened.

Resolution

To fix this issue, install cumulative Update 6 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.

Workaround

To work around this issue, restart the service or application pool to temporarily fix the issue.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

 

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