‘Error when attempting to connect to the Windows Live Calendar service’, but the calendar still works

Every time I receive an e-mail message I get the displayed error statement:

"There was an error when attempting to connect to the Windows Live Calendar service. If error persists, check to see if there is an upgrade of Windows Live Mail available or contact a service representative."

However, there is no noted error. The Calendar service works just fine and displays all my inputs to display over time. Question: How to get rid of the annoying erroneous message?  

[Original subject: Windows Live Mail]