When I try and use one of the workflow actions to send an email(enterprise, originally with attachments, however I have tried without) it fails with the following exception:
Could not load file or assembly ‘Microsoft.Exchange.WebServices, Version=184.108.40.206, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ or one of its dependencies. The system cannot find the file specified.
The normal email action (email these users) still works however.
System: SP2013 Standard On Premise
Workflow Action Pack (Trial Version)