This is a development question, please let me know if this is the wrong newsgroup for this. I'm trying to set the Account Number, Active, and Type of Business properties http://msdn2.microsoft.com/en-us/library/bb267853.aspx on an Outlook.ContactItem. However, it doesn't appear these are valid properties on the Outlook.ContactItem property. Can you advise how to set these as documented? I have also tried newAccount.ItemProperties["Account Number"].Value = "78"; and variations of this like AccountNumber, accountnumber, active, Active... Outlook.ContactItem newAccount = (Outlook.ContactItem)accounts.Items.Add("IPM.Contact.BCM.Account"); newAccount.FullName = "ABC Company"; //works newAccount.FileAs = "ACB Company"; //works newAccount.AccountNumber = "78"; //doesn't work, even though it's documented that this should work, same thing for Active and Type of Business newAccount.OfficeLocation = "Michigan"; //works newAccount.Save(); Thanks Brad