OpenLDAP for Windows
OpenLDAP is a free suite of client and server tools that implement the Lightweight Directory Access Protocol (LDAP) for Linux. We created OpenLDAP for Windows, a package that you can also use for free. It works out of the box so no additional software is needed.
The package is based on OpenLDAP 2.4.39 and includes most of the features available on Linux. The default backend is Berkeley DB with SSL support. OpenLDAP for Windows features complete Unicode support. The package has been tested on Windows 2000, Windows XP, Windows Server 2003, Windows Server 2008, Windows Vista and Windows 7.
The current version includes the implementation of OpenSSL 1.0.1j, which fixes the DTLS SRTP Bug, when Memory leak in d1_srtp.c in the DTLS SRTP extension in OpenSSL 1.0.1 before 1.0.1j allowed remote attackers to cause a denial of service (memory consumption) via a crafted handshake message.
OpenLDAP for Windows is free for private and commercial use.
You can learn how to install the OpenLDAP for Windows from this article.