We are in the process of moving mailboxes from Exchange 2003 to Exchange 2010. Clients are Outlook 2010. After the mailbox is moved and Outlook is launched, some users can't connect to their mailbox. When trying to recreate the profile Outlook autoconfigures and connects to the Exchange 2010 mailbox server instead of the CAS array. The workaround is to hard code the CAS array in. Anyone see this problem before?