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uninstalling RPC / reinstalling now
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We're not able to connect any of our Outlook 2013 client to Exchange 2013 sp1.<br />
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The event log has a lot of these errors.<br />
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Cannot add duplicate collection entry of type 'add' with unique key attribute 'path' set to 'C:\Windows\System32\RpcPr<wbr />oxy\RpcPro<wbr />xy.dll<br />
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Could this be causing our Outlook clients to not connect to Exchange?
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We're not able to connect any of our Outlook 2013 client to Exchange 2013 sp1.

The event log has a lot of these errors.

Cannot add duplicate collection entry of type 'add' with unique key attribute 'path' set to 'C:\Windows\System32\RpcProxy\RpcProxy.dll

Could this be causing our Outlook clients to not connect to Exchange?

Exchange 2013 Event Log RPC Error

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.