How can I resolve a recipient without FullName.

I set myContactItem to the ContactItem I want to resolve and after :

VB Code:
  1. Set myRecipient = myApplication.Session.CreateRecipient(myContactItem.CompanyName)

  2.  
  3. Call myRecipient.Resolve 'This returns false


I know that myRecipient.Resolve is working with the fullName, but the contactItem don't have one!