CPU usage is high when you use RPC over HTTP protocol in Windows 8.1 or Windows Server 2012 R2

Consider the following scenario that takes Microsoft 2013 as an example:

  • The Mailbox role is enabled in 2013.
  • mailboxes use extended MAPI to communicate with the Exchange Server.
  • The extended MAPI uses over HTTP (remote procedure call over HTTP) protocol.
  • Many clients (such as devices) are dropping connections to the Server.

In this scenario, the CPU usage on the may reach 100 percent.\

Hotfix: https://support.microsoft.com/en-us/hotfix/kbhotfix?kbnum=3041832&kbln=en-US

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