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Microsoft Exchange Server 2013 High Availability by Nuno Mota

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Architectural changes

Exchange 2013's architecture is very different from Exchange 2010 as we have seen in the last few chapters. In the previous versions of Exchange, all the components for UM were located on a server with the UM server role installed. With the new architecture of Exchange 2013, the UM server role has been eliminated, and the UM functionality now exists across the CAS and Mailbox server roles.

Two new services are used in Exchange 2013 for UM:

  • Microsoft Exchange Unified Messaging Call Router service (MSExchangeUMCR or Microsoft.Exchange.UM.CallRouter.exe) running on CASs and listening on TCP port 5060
  • Microsoft Exchange Unified Messaging service (MSExchangeUM or umservice.exe) running on Mailbox servers

The UM Worker Process (

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