Outlook Email Converted to PDF Auto-Opens

I have Adobe Pro 9.0 and Office 2010.  When I "print" an Outlook email to PDF, Adobe automatically opens the new PDF on top of the Outlook item. 

I have about 200 emails to do this with, and must name them individually, so I cannot use an batch option.

Is the auto-open a function of Adobe or Outlook?  How do I stop it from automatically opening, or make it open on my secondary monitor?  Either option is preferred over having to close an extra document in this process.

Thanks!