How Do I Resolve the Error: Could not Load File or Assembly ‘Microsoft.Exchange.WebServices?

The following error is contained within the EventLog when starting the XMAutomate Service (v5.1.1):

XMAutomate.sysTimer_Elapsed: Could not load file or assembly ‘Microsoft.Exchange.WebServices, Version=14.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ or one of its dependencies. The system cannot find the file specified.

This is because the file Microsoft.Exchange.WebServices.dll which is located at C:\Program Files (x86)\XMPro Pty Ltd\XMAutomate is not copied to the installed service folder.

Answer

Copy the DLL to the service folder created under the XMAutomate folder and restart the service.