A directory service software that would be appropriate to install on an exclusively Windows network is an: Active Directory.
What is a directory service?
A directory service can be defined as a software system that's designed and developed to store, organize and provide end users with a name and an access to directory information, so as to effectively and efficiently unify (synchronize) all network resources.
In this scenario, an Active Directory is a directory service software that would be appropriate to install on an exclusively Windows network because it uses Lightweight Directory Access Protocol (LDAP).
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