This is a simple macro example that describes how to update outlook contacts:
Sub updateContacts()
Dim ContactsFolder As Folder
Dim Contact As ContactItem
Set ContactsFolder = Session.GetDefaultFolder(olFolderContacts)
i = 0
For Each Contact In ContactsFolder.Items
first_name = Contact.FirstName
middle_name = Contact.MiddleName
last_name = Contact.LastName
If middle_name <> "" Then
Contact.FirstName = first_name & " " & middle_name
Contact.MiddleName = ""
Contact.Save
i = i + 1
End If
Next
MsgBox ("Contacts Found: " & ContactsFolder.Items.Count & ", Updated: " & i)
End Sub