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.
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.