There are at least 2 types of address books in Outlook: 'MAPI' and 'LDAP'.
I try to read all of it by the following working code:

///////////////////////////////////////
bool ReadAddressBooks()
{

// Initialize MAPI.
HRESULT hRes = S_OK;

if (FAILED(hRes = MAPIInitialize(NULL)))
{
return false;
}

HRESULT hr;
LPMAPISESSION pSess;
hr = MAPILogonEx(0, NULL, NULL, MAPI_EXTENDED, &pSess);
if(FAILED(hr))
{
MAPIUninitialize();
return false;
}


// open address book
LPADRBOOK pAddr;
hr = pSess-OpenAddressBook(0, 0, 0, &pAddr);
if(FAILED(hr))
{
pSess-Logoff(0, 0, 0);
MAPIUninitialize();
return false;
};

ULONG obj_type;

// open root container by passing a NULL entry ID
LPMAPICONTAINER rootContainer = NULL;
hr = pAddr-OpenEntry( 0, NULL, NULL, 0, &obj_type,
(LPUNKNOWN*)&rootContainer);

//Get hierarchy table
LPMAPITABLE root_hierh_table, hierh_table;
hr = rootContainer-GetHierarchyTable(0, &root_hierh_table);

// columns
SizedSPropTagArray( 2, columns) = { 2, PR_ENTRYID, PR_DISPLAY_NAME};


LPSRowSet rows = NULL;

//if( SUCCEEDED( HrQueryAllRows( hierh_table,
// (LPSPropTagArray) &columns, &andNode, NULL, 0, &rows)))
if( SUCCEEDED( HrQueryAllRows( root_hierh_table,
(LPSPropTagArray) &columns, NULL, NULL, 0, &rows)))
{
if( rows-cRows)
{
int rows_count = rows-cRows;
for (int row_number = 0; row_number rows_count; row_number++)
{
LPMAPICONTAINER mapiContainer = NULL;
LPMAPITABLE lpContenTstable = NULL;
ULONG objectType = 0;

LPSPropValue lpDN_contN =
PpropFindProp(rows-aRow[ row_number].lpProps,rows-aRow[
row_number].cValues,PR_DISPLAY_NAME);

CString Cont_Name = lpDN_contN-Value.lpszW;

LPSPropValue lpDN_cont =
PpropFindProp(rows-aRow[ row_number].lpProps,rows-aRow[
row_number].cValues,PR_ENTRYID);

_PV* ContainerEntryId = NULL;
ContainerEntryId = &lpDN_cont-Value;
if (!ContainerEntryId)
{ continue;};

// open container
HRESULT hResult = pSess-OpenEntry(ContainerEntryId-bin.cb,
(LPENTRYID)ContainerEntryId-bin.lpb,
NULL, MAPI_BEST_ACCESS, &objectType, (LPUNKNOWN *) &mapiContainer);

if( FAILED( hResult))
{
continue;
}

ULONG ulFlags = NULL;
lpContenTstable = NULL;
hr = mapiContainer-GetContentsTable(ulFlags, &lpContenTstable);
if (hr!=S_OK)
{
}

hierh_table = NULL;
hr = mapiContainer-GetHierarchyTable(0, &hierh_table);

ULONG ulRows; //Number of rows in the MAPI table

ulRows = 0;
if (lpContenTstable)
hr = lpContenTstable-GetRowCount(0, &ulRows);

ulRows = 0;
if (hierh_table)
hr = hierh_table-GetRowCount(0, &ulRows);

if (hierh_table) hierh_table-Release();
if (lpContenTstable) lpContenTstable-Release();
if (mapiContainer) mapiContainer-Release();
} //for all rows (containers)
}// if rows count 0
FreeProws( rows);
}//HrQueryAllRows

if (root_hierh_table) root_hierh_table-Release();
if (rootContainer) rootContainer-Release();
if (pAddr) pAddr-Release();
if (pSess) pSess-Release();

MAPIUninitialize();
return true;
}
///////////////////////////////////////////////////////////////////////////////////


In 'Cont_Name' I have sequentially receiving 2 names of address books:
- 'Outlook address book' (standart)
- 'name of my LDAP address book'

Then I receive valid number of folders in 'Outlook address book' and all
contacts in they (not in this code).
This part is working good.

And I can't receive any item in 'Hierarchy' or 'Contents' tables of 'LDAP
address book'.
Received contained items count is 0 (zero) in both cases.
Why ?
How can I read 'LDAP'-type Outlook address book contents programmatically ?
My 'LDAP'-connection contain several contacts, sure !
And I see them in Outlook.