Symptoms
Collaboration Data Objects (CDO) 1.1 supports programmatic access to MAPI Address Booksthrough the AddressEntries collection of an AddressList object. EachAddressList object corresponds to a MAPI Address Book and is a member ofthe AddressLists collection of the Session object.
The available AddressBooks can be enumerated by walking the AddressLists collection, and anindividual address book can be selected by indexing the AddressListscollection by name or by position.
The following sample code walks the AddressListscollection, and displays information about each address book that can be accessed. Thesecond part of the sample selects the global address list (GAL) and then walksthe Address Entries, recursively expanding Distribution Lists.
Resolution
The following sample code applies to any 32-bit Visual Basic-based product.
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Step-by-step exampleCreate a new Visual Basic project. Add a reference to the Collaboration Data Objects1.1 Object Library.Type the following code into a module.

Option ExplicitSub main()Dim objSession As MAPI.Session’ Use early binding for’ efficiency.Dim collAddressLists As AddressListsDim objAddressList As AddressListDim collAddressEntries As AddressEntriesOn Error GoTo error_olemsg’ Create a session and log on.Set objSession = CreateObject(“MAPI.Session”)’ Use a valid Exchange profile name.objSession.Logon (“<Your Profile Name Here>”)’Walk the available address books.Set collAddressLists = objSession.AddressListsFor Each objAddressList In collAddressLists’ Display collection selection indices.Debug.Print objAddressList.Name,Debug.Print objAddressList.Index,’ Display the readonly access flag.Debug.Print objAddressList.IsReadOnly,’ Display the count of recipients.Set collAddressEntries = objAddressList.AddressEntriesDebug.Print Str(collAddressEntries.Count)’ If there are any AddressEntries, display the first recipient name.If Not objAddressList.AddressEntries(1) Is Nothing Then _Debug.Print objAddressList.AddressEntries(1).NameNext objAddressList’ Walk the global address list.Set collAddressEntries = objSession.AddressLists( _”Global Address List”).AddressEntriesWalkAddressList collAddressEntries’ Close the session and log off.objSession.LogoffExit Suberror_olemsg:MsgBox “Error ” & Str(Err) & “: ” & Error$(Err)Exit SubEnd Sub’ Walk an AddressEntries collection and recursively expand’ Distribution Lists.Sub WalkAddressList(collAddressEntries As AddressEntries)Dim objaddressEntry As AddressEntryFor Each objaddressEntry In collAddressEntries’ Display the recipient’s name.Debug.Print objaddressEntry.Name,’ Display the recipient’s type.Select Case objaddressEntry.DisplayTypeCase ActMsgUserDebug.Print “Exchange Recipient”Case ActMsgDistListDebug.Print “Distribution List”WalkAddressList objaddressEntry.MembersDebug.Print “End of DL ” & objaddressEntry.NameCase ActMsgForumDebug.Print “Public Folder”Case ActMsgAgentDebug.Print “Agent”Case ActMsgPrivateDistListDebug.Print “Private DL”Case ActMsgOrganizationDebug.Print “Organization”Case ActMsgRemoteUserDebug.Print “Custom Recipient”Case ElseDebug.Print “Unknown type”End SelectNext objaddressEntryEnd SubVisual Basic only: Set Sub Main to run in the Project Properties, andthen run the application.
Other VBA applications: In the Debug/Immediate window, type MAIN,and then press ENTER.The output will appear in the Debug/Immediate window.
NotesThe address book can have restricted entries. Restricted entries will generate an”Access Denied” message:

Error -2147024891: [Collaboration Data Objects - [E_ACCESSDENIED(80070005)]]The user can include additional error handling where required.