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IdFix -for DirSync - duplicate mailnickname attributes, should I be concerned?

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.

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Vasil Michev (MVP)

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Garry Shape

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I guess I'm not sure why the mailnickname is not being derived from the UPN or primary smtp address.
So I have a user JDoe with mailnickname of "JDoe", whereas their upn is "JDoe2@domain.com" and their primary e-mail is JDoe2@domain.com" as well, so I don't know why mailnickname is staying as "JDoe".
Is it fine to just change the mailnickname to be JDoe2? That shouldn't cause issue with authentication or mail flow right?

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Vasil Michev (MVP)

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