I'm looking to go Exchange 2010 Hybrid, and right now I'm working to make sure my Active Directory is "cleaned properly" prior to moving forward with setting up a DirSync server.
I ran the tool recommended, IdFix, and it is reporting a number of duplicate "mailnickname" attributes, as I have two domains in a single forest.
Does that have to be corrected?
My understanding was as long as all UserPrincipalName's match their e-mail addresses (which would make them unique in our environment), then that would suffice and no other duplicate attributes would really be an issue.
Screenshot of results:
I exported to Excel and confirmed that it's finding the duplicate of this attribute between one domain and a different domain, both of which are in the same, single forest, however.