We're running a mixed Exchange 2010 / 2013 environment. We're starting to plan our mailbox moves over the next few weeks. We've run across an issue where a user, with a mailbox in Exchange 2013, is unable to open an additional mailbox that's on Exchange
2010 if it has an Archive mailbox configured. If there's no Archive, it connects right away. I'm stumped on why it's unable to get both the mailbox and archive mailbox opened. Has anyone run into this?
Orange County District Attorney