How do I clear a mail merge datasource without removing the mail merge functionality or the mail merge fields?  I only see the option to 'CHANGE' the datasource, but not 'REMOVE' it.  Help in doing this manually or programmatically would help.

I will be opening the letter and assigning the mail merge datasource programmatically from an Access database, but I do not want the letter inherently tied to any specific database.  It takes longer to open the letter right now because it's opening the datasource it's tied to, and then opening the datasource I set programmatically.

Your help is greatly appreciated.