Outlook Remote Procedure Call (RPC) Errors

MS Outlook is a one of the most widely used e-mail client applications in the world.  When Outlook stops working properly it can be a very frustrating experience.  Users have reported issues where they are unable to send or receive e-mails.  When they attempt to update their inbox or send an e-mail, they receive an error message stating:

Outlook is unable to connect to the server because the required RPC system component is not configured correctly

The PRC component referred to is the Rpcrt4.dll file.  This is the file that controls communication between the e-mail server and Outlook.  The Rpcrt4.dll file is part of the system registry on the computer and correcting this situation requires the user to edit the registry.  Advanced Windows users can use the Regedit command to add the Rpcrt4.dll entry in the appropriate folder:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ClientProtocols

Most users will want to use a third party registry utility to fix this issue because a mistake using the Regedit command can cause serious damage to the operating system.

Once the registry is fixed, the Outlook PST file will need to be repaired.  This is because the broken registry entry will have corrupted data stored in the PST file.  Run the Scanpst.exe tool found in:

C:\Program Files\Common Files\System\MSMAPI\1033

Locate the PST file using the Browse function and click on Scan.  The Scanpst.exe tool will search for errors in the PST file and automatically repair them.  If Outlook continues to experience problems sending and receiving e-mails, use a more robust Outlook PST Repair utility from a third party vendor to address the problem.

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