uses
   ComObj, Variants, SysUtils;

 type
   TContact = record
     LastName: string;
     FirstName : string;
     Company : string;
     // ###  Further properties. See MSDN 
  end;


   //------------------------------------------------------------------------------ 
{:Add outlook contact 

@param ContactFolderPath The contact path. E.g.: '' for default contact folder, 
  'SubFolder\Sub2\Test' for subfolders 
@param Contact The contact informations. 
@author 19.09.2003 Michael Klemm}
   //------------------------------------------------------------------------------ 
procedure OutlookAddContact(ContactFolderPath : string; Contact : TContact);
 const
   olFolderContacts = $0000000A;
 var
   Outlook : OleVariant;
   NameSpace : OleVariant;
   ContactsRoot : OleVariant;
   ContactsFolder : OleVariant;
   OutlookContact : OleVariant;
   SubFolderName : string;
   Position : integer;
   Found : boolean;
   Counter : integer;
   TestContactFolder : OleVariant;
 begin
   // Connect to outlook 
  Outlook := CreateOleObject('Outlook.Application');
   // Get name space 
  NameSpace := Outlook.GetNameSpace('MAPI');
   // Get root contacts folder 
  ContactsRoot := NameSpace.GetDefaultFolder(olFolderContacts);
   // Iterate to subfolder 
  ContactsFolder := ContactsRoot;
   while ContactFolderPath <> '' do
   begin
     // Extract next subfolder 
    Position := Pos('\', ContactFolderPath);
     if Position > 0 then
     begin
       SubFolderName := Copy(ContactFolderPath, 1, Position - 1);
       ContactFolderPath := Copy(ContactFolderPath, Position + 1, Length(ContactFolderPath));
     end
     else
     begin
       SubFolderName := ContactFolderPath;
       ContactFolderPath := '';
     end;
     if SubFolderName = '' then
       Break;
     // Search subfolder 
    Found := False;
     for Counter := 1 to ContactsFolder.Folders.Count do
     begin
       TestContactFolder := ContactsRoot.Folders.Item(Counter);
       if LowerCase(TestContactFolder.Name) = LowerCase(SubFolderName) then
       begin
         ContactsFolder := TestContactFolder;
         Found := True;
         Break;
       end;
     end;
     // If not found create 
    if not Found then
       ContactsFolder := ContactsFolder.Folders.Add(SubFolderName);
   end;
   // Create contact item 
  OutlookContact := ContactsFolder.Items.Add;
   // Fill contact information 
  OutlookContact.FirstName := Contact.FirstName;
   OutlookContact.LastName := Contact.LastName;
   OutlookContact.CompanyName := Contact.Company;

   // ### Further properties 

  // Save contact 
  OutlookContact.Save;
   // Disconnect from outlook 
  Outlook := Unassigned;
 end;