We are going to be migrating from Exchange 2003 to 2010. All of our clients are currently running Outlook 2007. I know that during the mailbox migration the user's mailbox will be offline and that they will need to close Outlook and open it back up for autodiscover to kick in. What user interaction does Outlook require the first time they access their mailbox on the new server? I would appreciate descriptive steps so that I can make it very clear to my users what to expect. Thanks in advance!