Introduction to Lightweight Directory Access Protocol (LDAP)
Microsoft Knowledge Base Article: 196455 - To understand Lightweight Directory Access Protocol (LDAP) better, let's discuss X.500 and Directory Access Protocol (DAP).

LDAP & the Future of Directory Services (Part 1)
A new version of LDAP is on the horizon. This first installment of a two-part article examines how the revised protocol might change and how those changes might affect the future of directory services. Source: Windows & .NET Magazine, October 1997.

LDAP & the Future of Directory Services (Part 2)
This conclusion of a two-part article examines how Netscape, Novell, and Microsoft implement LDAP in their directory service solutions. Source: Windows & .NET Magazine, November 1997.

LDAP: Necessary But Not Sufficient
By David Chapell in ENT magazine, May 19, 1999.

The Evolution of LDAP
A brief history of the evolution of LDAP. Source: Windows & .NET Magazine, April 1998.

Using Ldp.exe to Find Data in the Active Directory
Microsoft Knowledge Base Article: 224543 - LDP.EXE is a Windows 2000 Resource Kit utility that can be used to perform LDAP (Lightweight Directory Access Protocol) searches against the Active Directory for specific information given search criteria.

BUG: Windows 2000 LDAP API Cannot Bind to LDAP Servers
Microsoft Knowledge Base Article: 258811 - The Microsoft LDAP API (wldap32.dll) cannot access LDAP servers that are multi-homed and have more than 51 IP addresses registered. This problem prevents the Active Directory Administration tools from accessing multi-homed Windows 2000 Domain Controllers with more than 51 IP addresses 

Exchange Server and Active Directory Utilize the Same LDAP Ports
Microsoft Knowledge Base Article: 240078 - Windows 2000-based domain controllers utilize Lightweight Directory Access Protocol (LDAP) port 389 for communication to the Active Directory. This port is utilized for client queries and administrative tasks. 

LDAP Sessions Do Not Time Out Properly
Microsoft Knowledge Base Article: 258066 - The time-out mechanism for Lightweight Directory Access Protocol (LDAP) may not work, causing old connections to remain connected. As a result, hundreds of stale LDAP connections may exist on a computer.

"LDAP UDP Operations Per Second" Counter Always Returns Zero
Microsoft Knowledge Base Article: 268969 - When you run System Monitor on a Windows 2000-based domain controller, the "LDAP UDP operations per second" counter from the NTDS Settings object always returns a value of zero instead of the expected values. 

Microsoft LDAP Error Codes
Microsoft Knowledge Base Article: 218185 - Microsoft Windows 2000 Active Directory uses the Internet-standard Lightweight Directory Access Protocol (LDAP) to access information. In response to various LDAP requests, a domain controller returns responses containing field LDAP error 

Multiple LDAP Binds to the Same Connection Cause Memory Leak
Microsoft Knowledge Base Article: 289644 - On a Windows 2000-based domain controller, multiple Lightweight Directory Access Protocol (LDAP) binds over the same connection to that domain controller cause a memory leak.

Stand-Alone "LDAP://" Query Does Not Work
Microsoft Knowledge Base Article: 220594 - When you attempt a stand-alone query using LDAP://, you may receive the following error message: An error occurred while performing the search. Your computer, your Internet service provider, or the specified directory service may be disconnected. Check your connections and try again.