I am currently performing a migration from Exchange 2010 to Exchange 2013. For the new Exchange 2013 environment I have 3 servers. Two servers are in the main site and one in the disaster site. The first server in the main site and the one in the
disaster site have both the mailbox and client access role and a set up in a DAG. The second server at the main site is to be used to host archive mailboxes for users and has only the mailbox role installed. The 2010 setup is also similar just that all the
servers are located at the main site. I migrated a couple of users from the 2010 server to the new 2013 server. I realize that when a user on the Exchange 2013 server uses Outlook(both 2010 and 2013) and tries to expand his online archive it requests for authentication
and after entering the credentials is still unable to access it. However, the same user can access the online archive when they use OWA.
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