Active Directory is the most popular target system to be integrated with any identity solution ( One Identity Manager ,OpenIDM by Forgerock, IdentityIQ or IdentityNow by Sailpoint, Okta, One Login,etc.) . As part of your vendor initial discovery phase to identify the company business cases, your team needs to be prepared to respond the following questions:

1. Who/Which team is the owner of Active Directory?
2. What’s their availability to participate in this project?
3. What is your Active Directory version?
4. Are there any plans for upgrading/migrating/updating AD?
5. Does your AD schemas was extended? Which attributes? is there any custom extended attribute required to be handled by the identity solution?

Read more at allidm.com: 18 questions to ask for Active Directory implementation with an Identity Manager tool.