Active Directory authentication integration

Hello,
I’m creating a WP site for someone who wants users to be able to enter their WP credentials once, and then be logged into his other, external applications, like hosted email, etc. He has an active directory server.
Am I right to assume that one of the LDAP plugins should be able to accomplish this fairly painlessly? I’m not very good with programming; would it be complicated? Any specific recommended plugin?
Thanks