ContactItem.EntryID Property (Outlook)
Returns a String representing the unique Entry ID of the object. Read-only.
This property corresponds to the MAPI property PidTagEntryId.
A MAPI store provider assigns a unique ID string when an item is created in its store. Therefore, the EntryID property is not set for an Outlook item until it is saved or sent. The Entry ID changes when an item is moved into another store, for example, from your Inbox to a Microsoft Exchange Server public folder, or from one Personal Folders (.pst) file to another .pst file. Solutions should not depend on the EntryID property to be unique unless items will not be moved. The EntryID property returns a MAPI long-term Entry ID. For more information about long- and short-term EntryIDs, search http://msdn.microsoft.com for PidTagEntryId.
This Visual Basic for Applications (VBA) example uses the EntryID property to compare the Entry ID of one contact to the Entry ID of a contact returned by a search operation to determine whether the objects represent the same contact. Replace the name with a valid contact name in your Contacts folder before running this example.
Sub UseEntryID() Dim myNamespace As Outlook.NameSpace Dim myContacts As Outlook.Folder Dim myItem1 As Outlook.ContactItem Dim myItem2 As Outlook.ContactItem Set myNameSpace = Application.GetNamespace("MAPI") Set myContacts = myNameSpace.GetDefaultFolder(olFolderContacts) Set myItem1 = myContacts.Items.Find("[FirstName] = ""Dan""") Set myitem2 = myContacts.Items.Find("[FileAs] = ""Wil"" and [FirstName] = ""Dan""") If Not TypeName(myitem2) = "Nothing" Then If myItem1.EntryID = myitem2.EntryID Then MsgBox "These two contact items refer to the same contact." End If Else MsgBox "The contact items were not found." End If End Sub