More Info on attachments :

Using the Attachments Collection

Use the Attachments property to return the Attachments collection for any Outlook item (except notes).

Use the Add method to add an attachment to an item.

To ensure consistent results, always save an item before adding or removing objects in the Attachments collection of the item.

The following Visual Basic for Applications example creates a new mail message, attaches a Q496.xls as an attachment (not a link), and gives the attachment a descriptive caption.

VB Code:
  1. Set myOlApp = CreateObject("Outlook.Application")

  2. Set myItem = myOlApp.CreateItem(olMailItem)

  3. myItem.Save

  4. Set myAttachments = myItem.Attachments

  5. myAttachments.Add "C:\My Documents\Q496.xls", _

  6.     olByValue, 1, "4th Quarter 1996 Results Chart"