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Old contacts are receiving/replaced with Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=someone

I have now migrated from Exchange 2010 to exchange 2013. In doing so I  deleted several outside email contacts.
Now when they reply to an email from one of these contacts it gets replaced with this:
:/o=ABC/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=someone

However, when they forward the message and type in the email it works. It seems only to happen when they reply back to the contact.
I did have them clear out there outlook cache with that contact but it still happens.

How can I prevent this from happening?
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Simon Butler (Sembee)
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I will check
Would it be best to start a new OAB?

How do you create a new OAB and get it uploaded and in Service?
I did see an OAB out there listed as Default Offline address list (Ex2013) I selected that for all the databases. I
Is there a way to refresh this one?
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You put me in the right direction and noteworthy.