Error message in Application Server in Dynamics SL. “Your server administrator has limited the number of items you can open simultaneously…”

You may receive a message that resembles the follow in Application Server:

This message will occur when the Process Email Requests option in the Application Server properties is enabled. To resolve this message, On the General tab of the Application Server Properties, in the Process Email Requests area,  select the 
Off, Don’t process any emails radio button.