Send email (Exchange) Error: can not load assembly

I try to use the action: Send E-Mail with Attachments (Exchange), but execution fails with message:

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

Any server setup required to give the SharePoint environment access to Exchange?


Duplicate of the same issue, please see this post: